Free Coordination and Control MCQs with Answers
83 Coordination and Control MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
83 questions · page 9 of 9
81. Which of the following cells possess Nissl's granules?
- A. Nerve cells
- B. WBC
- C. RBC
- D. Platelets
Explanation: Nissl granules are stacks of rough endoplasmic reticulum in the cell body of a neurone, supporting the heavy protein synthesis a nerve cell requires. Mature red blood cells have no nucleus and almost no organelles at all, and platelets are only cell fragments. Their loss after injury, called chromatolysis, is a recognised sign of neuronal damage.
Correct answer: Nerve cells82. Which part of human brain is involved in maintaining the posture and balance of the body?
- A. Cerebrum
- B. Cerebellum
- C. Hypothalamus
- D. Medulla oblongata
Explanation: The cerebellum receives information from muscles, joints and the balance organs of the inner ear and smooths the commands issued by the cerebrum, so damage to it leaves movement clumsy and unsteady even though strength is normal. Alcohol depresses it, which is why an intoxicated person staggers. The medulla controls heart rate and breathing instead.
Correct answer: Cerebellum83. Which type of neurons stimulate muscles to contract in a reflex arc?
- A. Motor neurons
- B. Sensory neurons
- C. Interneurons
- D. Afferent neurons
Explanation: Motor, or efferent, neurones carry impulses away from the central nervous system to the effector, which in this case is a muscle that contracts. Sensory and afferent are two names for the same thing, neurones carrying impulses inwards, which is why both appear as options. Interneurones link the two inside the spinal cord but do not reach the muscle.
Correct answer: Motor neurons