Question

26-31

1. A reflex arc:
   1. includes a sensory neuron
   2. includes a motor neuron
   3. does not involve the brain
   4. each of the above is correct

2. The patellar tendon reflex (as done in class):
   1. involves a stretch receptor in the quadriceps
   2. involves an inhibitory response in the biceps femoris
   3. both a. and b. are correct
   4. neither a. nor b. is correct

3. Cranial Nerve VIII is the:
   1. vestibulocochlear nerve
   2. spinal accessory nerve
   3. abducens nerve
   4. facial nerve

4. The precentral gyrus:
   1. sends motor signals to the arms and thighs
   2. receives sensory signals from the face and forehead
   3. both a. and b. are correct
   4. neither a. nor b. is correct

5. The cerebrum includes regions that interpret action potentials related to:
   1. movement of limbs
   2. vision
   3. both a. and b. are correct
   4. neither a. nor b. is correct

6. The parasympathetic nervous system is involved in:
   1. digestion
   2. heart rate
   3. both a. and b. are correct
   4. neither a. nor b. is correct

Answer 1

26	d. each of the above is correct	A reflex arc is a neural pathway that controls a reflex. Stimulus, sensory neuron, intermediary neuron, motor neuron and defector organ is the correct order of general reflex arc.
27	a. involves a stretch receptor in the quadriceps	Striking of the patellar tendon with a reflex hammer just below the patella stretches the muscle spindle in the quadriceps muscle. This produces a signal which travels back to the spinal cord and synapses (without interneurons) at the level of L3 in the spinal cord, completely independent of higher centres.
28	a. vestibulocochlear nerve	The eighth cranial nerve is the vestibulocochlear nerve. The vestibulocochlear nerve is responsible for the sense of hearing and it is also pertinent to balance, to the body position sense.
29	a. sends motor signals to the arms and thighs	The precentral gyrus is the anatomical location of the primary motor cortex, which is responsible for controlling voluntary motor movement on the body's contralateral side.
30	b. vision	The cerebrum is a major part of the brain, controlling emotions, hearing, vision and personality. It controls all precision of voluntary actions.
31	a. digestion	The parasympathetic nervous system is one of three divisions of the autonomic nervous system. Sometimes called the rest and digest system, the parasympathetic system conserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles in the gastrointestinal tract.