Skeleton System MCQ Quiz - Objective Question with Answer for Skeleton System - Download Free PDF

The correct answer is Middle Ear.

• The Malleus bone is located in our Middle Ear.

Key Points

• The malleus is the outermost and largest of the three small bones in the middle ear and reaches an average length of about eight millimetres in the typical adult.
• It is informally referred to as a hammer, owing to it being a hammer-shaped ossicle or small bone that is connected to the ear.
• It is composed of the head, neck, anterior process, lateral process, and manubrium.
• When sound reaches the tympanic membrane (eardrum), the malleus transmits these sound vibrations from the eardrum to the incus, and then to the stapes, which is connected to the oval window.
• In cases of atticoantral disease, an inflammatory disease of the middle ear, the ossicular chain (malleus, incus, and stapes) is often affected by abnormal skin growth, called cholesteatoma.

Additional Information

• Outer Ear:
  • ​The medical term for the outer ear is the auricle or pinna. The outer ear is made up of cartilage and skin.
  • There are three different parts to the outer ear; the tragus, helix, and lobule. 
• Pinna:
  • The auricle (pinna) is the visible portion of the outer ear. It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified.
• Middle Ear:
  • ​The middle ear is the portion of the ear internal to the eardrum, and external to the oval window of the inner ear.
  • The mammalian middle ear contains three ossicles, which transfer the vibrations of the eardrum into waves in the fluid and membranes of the inner ear.

Important Points 

Key Points

• The Stapes, also known as the stirrup bone, is the smallest bone in the human body.
• It is located in the middle ear and is one of the three auditory ossicles that play a critical role in hearing.
• The stapes bone is approximately 3mm in length, making it the smallest bone in the human skeletal system.
• Its primary function is to transmit sound vibrations from the middle ear to the inner ear (specifically the oval window).

Additional Information

• Auditory Ossicles:
  • The human ear contains three small bones collectively called the auditory ossicles: Malleus (hammer), Incus (anvil), and Stapes (stirrup).
  • These bones are located in the middle ear and work together to amplify sound vibrations and transmit them to the inner ear.
  • The Malleus is connected to the eardrum, the Incus connects the Malleus to the Stapes, and the Stapes connects to the oval window of the cochlea in the inner ear.
• Middle Ear:
  • The middle ear is the air-filled cavity located behind the eardrum and houses the auditory ossicles.
  • Its primary function is to transmit sound vibrations from the outer ear to the inner ear.
  • The middle ear is also connected to the nasopharynx via the Eustachian tube, which helps equalize air pressure on both sides of the eardrum.
• Inner Ear:
  • The inner ear contains the cochlea, which is responsible for converting sound vibrations into electrical signals that the brain can interpret as sound.
  • The stapes directly interacts with the oval window, a membrane-covered opening to the cochlea, to facilitate this process.
• Hearing Process:
  • Sound waves enter through the outer ear and cause the eardrum to vibrate.
  • These vibrations are transmitted to the auditory ossicles (Malleus, Incus, Stapes) in the middle ear.
  • The stapes amplifies the vibrations and transmits them to the oval window of the cochlea in the inner ear.
  • The cochlea converts these mechanical vibrations into electrical signals, which are then sent to the brain via the auditory nerve.

Key Points

• Glycogen is a multi-branched polysaccharide of glucose that serves as a form of energy storage in humans, animals, fungi, and bacteria.
• In humans, glycogen is made and stored primarily in the cells of the liver and skeletal muscle.
• When the body requires energy, glycogen is broken down into glucose to be used by cells for metabolic processes.
• Glycogen storage is crucial for maintaining blood glucose levels and providing a quick source of energy during physical activities.

Additional Information

• Pathogen
  • A pathogen is a biological agent that causes disease or illness to its host.
  • Examples include bacteria, viruses, fungi, and other microorganisms.
• Morphogen
  • A morphogen is a substance that governs the pattern of tissue development in the process of morphogenesis.
  • It determines the positions of various specialized cell types within a tissue.
• Pepsinogen
  • Pepsinogen is an inactive precursor (zymogen) of pepsin, an enzyme that breaks down proteins in the stomach.
  • It is secreted by the gastric chief cells of the stomach lining and is activated by hydrochloric acid.

Key Points

• The stapes is the smallest bone in the human body, located in the middle ear.
• It is one of the three ossicles in the middle ear, the other two being the malleus and incus.
• The stapes helps in the conduction of sound vibrations from the outer ear to the inner ear.
• It resembles a stirrup, which is why it is also known as the "stirrup bone."

Additional Information

• Mandible
  • The mandible, or lower jawbone, is the largest and strongest bone in the human face.
  • It holds the lower teeth in place and assists in mastication (chewing) and forms the lower part of the skull.
• Malleus
  • The malleus is a hammer-shaped small bone or ossicle of the middle ear.
  • It connects with the incus and is attached to the inner surface of the eardrum.
  • Its function is to transmit sound vibrations from the eardrum to the incus.
• Incus
  • The incus, also known as the anvil, is a bone in the middle ear.
  • The incus receives vibrations from the malleus to which it is connected laterally and transmits these to the stapes medially.
• Stapes
  • The stapes is the third bone of the three ossicles in the middle ear.
  • It transmits sound vibrations from the incus to the oval window, a membrane-covered opening to the inner ear.
  • The stapes is the smallest and lightest bone in the human body.

The correct answer is Synovial fluid.

Key Points

• Synovial fluid is a viscous fluid found in the cavities of synovial joints.
• It serves the purpose of lubricating the joints, reducing friction between the articular cartilage of synovial joints during movement.
• The fluid also plays a crucial role in nutrient distribution and waste removal for the cartilage cells within the joint.
• This fluid is produced by the synovial membrane, which lines the joint capsule.
• It also acts as a shock absorber, cushioning the joints during activities such as walking, running, and jumping.

 Additional Information

• Amniotic fluid
  • Amniotic fluid surrounds a developing fetus during pregnancy.
  • It protects the fetus by cushioning against external pressure and trauma.
  • It helps in the development of the fetal lungs and digestive system.
• Interstitial fluid
  • Interstitial fluid is found in the spaces between cells throughout the body.
  • It helps in the transport of nutrients, oxygen, and waste products to and from cells.
• Cerebrospinal fluid
  • Cerebrospinal fluid (CSF) is found in the brain and spinal cord.
  • It acts as a cushion for the brain, providing protection against physical impacts.
  • CSF also helps in the circulation of nutrients and removal of waste products from the brain.

The correct answer is Mandible.

Key Points

• Bones of the skull and three thin membranes called meninges are there to protect the brain.
• The brain is also cushioned and protected by cerebrospinal fluid.
• The skull is made up of 22 bones.
• The only bone that can move is Mandible.
• The nasal bone is part of the Skullbone.

​

• The atlas bone is the first of seven cervical vertebrae that supports the weight of the skull.
• The tibia is the bone that forms the shin part of the leg.
• The femur bone is the largest bone of the body, it is the thigh bone.

Additional Information

• Some important name of bones:
  • Knee- Patella
  • Thigh- Femur (largest bone)
  • Ankle- Tarsal
  • Fingers- Phalanges
  • Wrist- Carpals
  • Upper arms- Humerus
  • Palm- Metacarpal
  • Bones in ear- Malleus, Incus, Stapes (smallest bone)

*Note: gluteus maximus Largest muscle in the human body.

The correct answer is Middle Ear.

• The Malleus bone is located in our Middle Ear.

Key Points

• The malleus is the outermost and largest of the three small bones in the middle ear and reaches an average length of about eight millimetres in the typical adult.
• It is informally referred to as a hammer, owing to it being a hammer-shaped ossicle or small bone that is connected to the ear.
• It is composed of the head, neck, anterior process, lateral process, and manubrium.
• When sound reaches the tympanic membrane (eardrum), the malleus transmits these sound vibrations from the eardrum to the incus, and then to the stapes, which is connected to the oval window.
• In cases of atticoantral disease, an inflammatory disease of the middle ear, the ossicular chain (malleus, incus, and stapes) is often affected by abnormal skin growth, called cholesteatoma.

Additional Information

• Outer Ear:
  • ​The medical term for the outer ear is the auricle or pinna. The outer ear is made up of cartilage and skin.
  • There are three different parts to the outer ear; the tragus, helix, and lobule. 
• Pinna:
  • The auricle (pinna) is the visible portion of the outer ear. It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified.
• Middle Ear:
  • ​The middle ear is the portion of the ear internal to the eardrum, and external to the oval window of the inner ear.
  • The mammalian middle ear contains three ossicles, which transfer the vibrations of the eardrum into waves in the fluid and membranes of the inner ear.

Important Points 

The correct answer is 33.

• The human spinal column is made up of 33 bones.
• Vertebrae separated by intervertebral discs.

• Each vertebra is given a name according to its location.

• Formula - C7 T12 L5 S5 C4 
• The first vertebral column is Atlas which is connected with the skull.

The correct answer is between knee joints.

• The knee joint is an example of a hinge joint that allows movement in one plane.
• In this knee joint, the bone doesn't get rubbed with each other.

Key Points

• The hinge joint is a type of synovial joint which helps in bending and avoiding friction due to the presence of synovial fluid.
• Synovial fluid is a lubricating material that allows movement without getting rubbed.
• Bone combined with Ligaments, muscles, and tendons provides strength to the joint place.

Additional Information

The correct answer is Lactic acid.

Key Points

• During heavy exercise, the demand for energy is high but the supply of oxygen to produce energy is limited.
• Therefore, anaerobic respiration takes place in the muscles cells to fulfill the demand for energy.
• This anaerobic breakdown of glucose leads to the formation of lactic acid in muscles.
• The accumulation of lactic acid in muscles leads to muscle cramps.
• Hence During heavy exercise, we get cramps in the legs due to the accumulation of Lactic acid.
• So, the correct answer is 'Lactic acid'.

The correct answer is Ligaments.

• Ligaments are the connective tissue that connects two bones to each other.

Key Points

• Ligaments are short bands of tough flexible connective tissues which connect two bones.
• Ligaments connect bones to other bones.
• Tendons are made up of collagen.
• Tendons connect bones to muscles.
• There are 11 major organ systems in humans.
• Cartilage is an important structural component of the body. It is a firm tissue but is softer and much more flexible than bone.

Additional Information Bone to Cartilage:

• Cartilage is a type of connective tissue found in the body. When an embryo is developing, cartilage is the precursor to the bone.
• Some cartilage remains and is dispersed throughout the body, especially to cover the joints.
• Cartilage also composes most of the outer ear.

• Human beings have four types of teeth which are Incisors, Canine, Molar and Premolar.
• A normal adult mouth has 32 teeth.
• Incisors (8) help in biting into the food.
• Canines (4) help in tearing the food.
• Molars (12) help in grinding the food.
• Premolars (8) help in crushing the food.

The correct answer is Teeth.

Important Points

• Teeth consist mostly of hard, inorganic minerals like calcium.
• They also contain nerves, blood vessels, and specialized cells.
• They don’t have the regenerative powers that bones do and can’t grow back together if broken. So they are not considered as bone.
• Bones, on the other hand, are covered in a layer of cells called the periosteum that allow the bone to change over time.

Key Points

• The human skeletal system provides a structural framework and supports the body.
• It comprises bones, cartilage, ligaments, and tendons that connect to bones and bones to muscles.
• The human skeletal system provides a definite shape to the body and protection to internal organs.
• At the time of birth, infants have more bones (300 bones), which due to fusion in some of the bones, form larger bones and 206 bones remain in a human adult.
• The skeleton system is divided into two parts:
  • Axial skeleton- includes bones of the skull, upper and lower jaws, ribs, and vertebral column.
  • Appendicular skeleton- involves the bone of legs and hand, pectoral and pelvic girdle. 

Additional Information

•   Hair, Nails, Hooves are made of a tough protein called keratin.

• Ligaments are the connective tissue that connects two bones to each other.
• Ligaments are a short band of tough flexible connective tissues that connects two bones.
• Tendons are made up of collagen.
• Tendons connect bones to muscles.
• There are 11 major organ systems in humans.
• Cartilage is an important structural component of the body. It is a firm tissue but is softer and much more flexible than bone.