Question

2. The endoneurium wraps around groups of fasicles to form a never. True or False?

3. The fundamental physiological properties that enable nerve cells are

a. the ability to respond to enviromental changes

b. the ability to produce electrical signals that are quickly conducted to other cells at distant locations

c. the ability to secrete a chemical that will stimulate the next cell when an electrical signal reaches the end of an axon.

d. all of these choices are correct

4. Acetylcholinesterase

a. binds to nicotinic receptors

b. catalyzes hydrolysis of AChto remove it from the synaptic cleft

c. blocks muscarinic receptors

d. catalyzes resynthesis of ACh

5. A recently depolarized area of a cell membrane cannot generate an action potential because of the

a. absolute refractory period

b. high concentration of sodium ions in the extracellular fluid

c. presence of receptor sites on the membrane

d. high concentration of potassium ions in the cytoplasm

Answer 1

2.Answer is true.

Endoneurium wraps around groups of fasicles and form perineurium which forms nerve.

So, the answer is true.

3.Answer is option d.

The fundamental physiological properties that enable nerve cell are

Nerve helps to respond to environmental changes.

So,option a is correct.

Conduction of electrical signals to the distant location is also a property of nerve cells.

So,oltion b is correct.

Chemical secretion and stimulation of next cell when an electrical signal reaches end of an neuron is a property of nerve.

So option c is correct.

Hence ,option d that is all of these choices are correct.

4.Answer is option b.

Binding to the nicotinic,muscarinic receptors and resynthesis of ACh is not the function of acetylcholinesterase.

So,option a,c and d are not correct.

It catalyzes hydrolyses ACh and removes it from synaptic cleft by which it prevent sustained response.

Hence,option b is correct.

5.Answer is option a.

High concentration of sodium ion on ECF have no role in this context.

So,option b is not correct.

Receptor site on the membrane also have no role.

So,option c is not correct.

High concentration of potassium ions in the cytoplasm also have no role in preventing action potential.

So,option d is not correct.

Absolute refractory period is the time in which when an area of a cell depolarised with in this period if a second stimuli arrives it will not elicit a response.

Hence,option a is correct.