1. Which type of muscle is involuntary and lacks striations?
Answer:
Explanation:
Smooth muscles are involuntary, non-striated muscles found mainly in the walls of hollow organs.
2. Which of the following joints allows movement in all directions?
Answer:
Explanation:
Ball and socket joints, such as the shoulder and hip joints, allow movement in multiple directions.
3. Which protein in muscle fibers is responsible for binding oxygen?
Answer:
Explanation:
Myoglobin is a protein in muscle fibers that binds oxygen, which can be used during muscle contraction.
4. Bones are connected to muscles through:
Answer:
Explanation:
Tendons connect muscles to bones, facilitating movement.
5. The functional unit of contraction in a skeletal muscle is called:
Answer:
Explanation:
A sarcomere is the functional unit of contraction in skeletal muscles.
6. Which of the following is NOT a type of movable joint?
Answer:
Explanation:
Fibrous joints are immovable. They are connected by fibrous connective tissue.
7. In which part of the human body is the saddle joint found?
Answer:
Explanation:
The saddle joint is present at the base of the thumb, allowing it to move in multiple directions.
8. The sliding filament theory of muscle contraction involves which proteins?
Answer:
Explanation:
The sliding filament theory involves the interaction between actin and myosin filaments, causing muscle contraction.
9. Which of the following is NOT a function of the skeletal system?
Answer:
Explanation:
The skeletal system provides support, facilitates movement, and protects vital organs but does not synthesize vitamins.
10. Which bone is the longest in the human body?
Answer:
Explanation:
The femur, or thigh bone, is the longest bone in the human body.
11. Which of the following cells help in the repair and regeneration of skeletal muscles?
Answer:
Explanation:
Satellite cells play a crucial role in the repair and regeneration of damaged skeletal muscles.
12. The contraction of which muscle causes the arm to bend at the elbow?
Answer:
Explanation:
The contraction of the biceps muscle causes flexion or bending at the elbow.
13. "Birds have a _________ breastbone to which flight muscles are attached."
Answer:
Explanation:
Birds have a keel-shaped breastbone, which provides a large surface area for the attachment of flight muscles.
14. Which of the following does NOT form part of the axial skeleton?
Answer:
Explanation:
The axial skeleton consists of the skull, vertebral column, and ribcage. The pelvic girdle is part of the appendicular skeleton.
15. Which part of the brain controls voluntary movements?
Answer:
Explanation:
The cerebrum controls voluntary movements and several cognitive functions.
16. Arthropods exhibit which type of locomotion?
Answer:
Explanation:
Arthropods, such as insects and spiders, primarily exhibit walking and, in some cases like insects, flying.
17. The thick filament of a muscle fiber is primarily composed of:
Answer:
Explanation:
The thick filament of a muscle fiber is primarily composed of the protein myosin.
18. The point of contact between a motor neuron and a muscle fiber is called:
Answer:
Explanation:
The neuromuscular junction is the synapse or junction of the axon terminals of a motor neuron with the motor end plate.
19. Which of the following is NOT a type of simple movement in animals?
Answer:
Explanation:
Trophallaxis is the transfer of food or other fluids among members of a community, especially social insects. It's not a type of movement.
20. Which of the following bones is NOT associated with the leg?
Answer:
Explanation:
The ulna is a bone in the forearm and is not associated with the leg.