Physiology

Question 1

In myelinated axons, Na+ channels are concentrated

Answer 1

At the Nodes of Ranvier

Question 2

What happens to the vesicle after acetylcholine has been released into the presynaptic cleft?

Answer 2

The vesicle fuses with the cell membrane during neurotransmitter exocytosis, and therefore, no longer exists as a distinct structure

Question 3

Which of the following binds with Ca2+ in muscle contraction?

Answer 3

Troponin C;

Muscle binds - Troponin

Question 4

What type of contraction is involved if there is no change in muscle length?

Answer 4

Isometric

Question 5

Gamma motor neuron activity will

Answer 5

Increase the activity of the muscle spindle

Question 6

What neurotransmitter is associated with the motor endplate?

Answer 6

Acetylcholine;
Myasthenia Gravis affects the acetylcholine receptor site of the postsynaptic membrane (neuromuscular junction). Symptoms include: Skeletal muscle weakness & fatigability

Question 7

The Z-disc of muscle fibers is located in the

Answer 7

I band

Question 8

Acetylcholine acts at the myoneural junction to increase membrane permeability to________

Answer 8

Calcium

Question 9

Which of the following sensory nerve endings is believed to be primarily responsible for nociception?

Answer 9

Free nerve ending

Question 10

Which of the following dermal receptors has the highest rate of sensory adaptation?

Answer 10

Pacinian corpuscle;
Pacinian corpuscles are called
“Phasic receptors,” “Quick adaptors

Question 11

Which of the following autonomic responses does NOT require parasympathetic stimulation?

Answer 11

Mydriasis;
Mydriasis has a “d” in it for dilation
Meiosis is constriction (both of the eye)