1) What is the space between a neuron and a muscle referred to? What neurotransm

Question

1) What is the space between a neuron and a muscle referred to? What neurotransmitter is being released at the region?
a) synapse, acetylcholine
b) neuromuscular junction, nicotine
c) synapse, nicotine
d) neuromuscular junction, acetylcholine

e) none of the above

2) Surfactant?

a) protects the surface of the lungs

b) phagocytizes small particulates

c) replaces mucus in the alveoli

d) helps prevent the alveoli from collapsing

e) protects the surface of the lungs and helps prevent the alveoli from collapsing

3) Which heart valve prevents regurgitation into the left ventricle?
a) bicuspid
b) tricuspid
c) mitral
d) pulmonic
e) none of the above

4) What is the normal duration of a QRS complex?

Explanation / Answer

1 ans-D- neuromuscular junction,neurotransmitter released into the neuromuscular junction acetylcholine

Because neuromuscular junction is always acetylcholine.

2 ans-e) protects the surface of the lungs and helps prevent the alveoli from collapsing

Surfactant helps to prevent the alveoli from collapsing by  interfering with the cohesiveness of water molecules, thereby reducing the surface tension of alveolar fluid.

3 ans-a-bicuspid

The left venricle is the bicupsid volve also known as mitral volve.The oxygeneted blood flows out of the left atrium through the bicuspid ormitral volve and into the left ventricle.Mitral regurgitation is disease in which volve does npt close properly and this causes blood to leak back intothe left atrium when the left ventricle contract.

4 ans-80 and 100 milliseconds or 0.08-0.10 seconds

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