PNB Exam 3 Practice Questions with
verified answers rated A+
Excitation contraction coupling begins when the action potential stimulates __________ on the
T-tubule to open the ____________ on the sarcoplasmic reticulum - ANS ✔✔The DHP Receptor;
The RyR (Ryanodine Receptor)
A Calcium binding protein that regulates muscle contraction is: - ANS ✔✔Troponin
A motor unit consists of: - ANS ✔✔A single neuron synapsed to multiple muscle fibers
Little Timmy has a mutation that reduces the permeability of his voltage gated potassium
channels. In comparison to a normal person, his action potentials are likely to display: - ANS
✔✔A longer repolarization phase
Question Referes to figure 4 During Phase 2: (for reference look at a regular action potential
graph) [phase 2= membrane potential is becoming more positive~ it is where the graph rises]
what is happening in this phase? - ANS ✔✔Sodium permeability is increasing
Which of the following is NOT a characteristic of neurons? - ANS ✔✔Mitosis
(they are terminally differentiated)
Which of the following functions is associated with the hypothalamus? - ANS ✔✔Control of
body temperature
verified answers rated A+
Excitation contraction coupling begins when the action potential stimulates __________ on the
T-tubule to open the ____________ on the sarcoplasmic reticulum - ANS ✔✔The DHP Receptor;
The RyR (Ryanodine Receptor)
A Calcium binding protein that regulates muscle contraction is: - ANS ✔✔Troponin
A motor unit consists of: - ANS ✔✔A single neuron synapsed to multiple muscle fibers
Little Timmy has a mutation that reduces the permeability of his voltage gated potassium
channels. In comparison to a normal person, his action potentials are likely to display: - ANS
✔✔A longer repolarization phase
Question Referes to figure 4 During Phase 2: (for reference look at a regular action potential
graph) [phase 2= membrane potential is becoming more positive~ it is where the graph rises]
what is happening in this phase? - ANS ✔✔Sodium permeability is increasing
Which of the following is NOT a characteristic of neurons? - ANS ✔✔Mitosis
(they are terminally differentiated)
Which of the following functions is associated with the hypothalamus? - ANS ✔✔Control of
body temperature
