Veins that return blood directly to the heart include the ________.
A. brachiocephalic vein
B. superior vena cava
C. pulmonary arteries
D. azygos vein
E. portal vein
Answer: B
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The symbol Na+ represents a sodium atom that has lost an electron.
Answer the following statement true (T) or false (F)
When a nerve impulse reaches the transmissive segment of a neuron,
A. calcium is pumped into the neuron and neurotransmitter diffuses out through channels. B. calcium is released from the neuron along with neurotransmitter from synaptic vesicles. C. calcium diffuses into the neuron and neurotransmitter is released by exocytosis. D. calcium and neurotransmitter diffuse into the synaptic knob. E. calcium is immediately pumped out of the neuron and vesicles of neurotransmitter undergo phagocytosis.
The erythrocytes of people with type A blood contain __________ antigens and their plasma contains __________ antibodies
Fill in the blank(s) with correct word
What chemical is necessary for the transformation of angiotensin-I (A-I) into active angiotensin-II (A-II)?
A) angiotensinogen B) atrial natriuretic peptide (ANP) C) angiotensin-converting enzyme (ACE) D) renin