Blood returning from the systemic circuit enters the
A) left atrium.
B) left ventricle.
C) right atrium.
D) right ventricle.
Answer: C
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Why do people who have a heart attack often experience pain radiating along the left shoulder and arm?
A. Signals from nociceptors in the heart diverge and stimulate pain sensations in a large region. B. Signals from the cardiac and shoulder region converge and follow the same pathway to the cortex. C. Nociceptors from the cardiac and shoulder regions all send afferent signals through the phrenic nerve. D. Nociceptors from the cardiac and shoulder regions all send afferent signals through the vagus nerve. E. Lack of blood to the left shoulder and arm result in ischemia and stimulates nociceptors in those regions.
All of the following are typical characteristics of neurotransmitters exceptÂ
A. they alter the physiology of the postsynaptic cell. B. they bind to specific receptors on the postsynaptic cell. C. they are synthesized by a presynaptic neuron. D. they are released in response to stimulation. E. they are released into the bloodstream before reaching the postsynaptic cell.
The stretch reflex tests that you demonstrated in this lab require input from the brain in order to work properly.
Answer the following statement true (T) or false (F)
The effectiveness of birth control methods are measured based upon the percentage of women who do not become pregnant during what period of time?
A. 1 year B. 9 months C. 3 months D. 6 months