1) John\'s heart rate is 50 beats/min. During each cardiac cycle, 50 mL of blood

Question

1) John's heart rate is 50 beats/min. During each cardiac cycle, 50 mL of blood is ejected from his left ventricle. How much TOTAL BLOOD exits his HEART per minute?

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

3) 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

Explanation / Answer

1)  TOTAL BLOOD exits his HEART per minute is 5000 mL

2) e) none of the above, aortic valve prevents reflux of blood into the left ventricle

3) d) neuromuscular junction, acetylcholine,

A neuromuscular junction (or myoneural junction) is a chemical synapse formed by the contact between a motor neuron and a muscle fibre. It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fibre, causing muscle contraction. In vertebrates, motor neurons release acetylcholine (ACh), a small molecule neurotransmitter, which diffuses across the synaptic cleft and binds to nicotinic acetylcholine receptors (nAChRs) on the cell membrane of the muscle fiber, also known as the sarcolemma.

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