In cardiac muscle, calcium ions
A) are not released from the sarcoplasmic reticulum.
B) do not bind to troponin molecules.
C) play no role in the process of contraction.
D) enter the cell through slow voltage gated ion channels.
E) play an important role in repolarizing the membrane after the depolarization phase.
Answer: D
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Which of the following explains the neural mechanism of an erection?
A. It is an autonomic reflex mediated predominantly by parasympathetic nerve fibers. B. It is a somatic reflex mediated predominantly by parasympathetic nerve fibers. C. It is an autonomic reflex mediated predominantly by sympathetic nerve fibers. D. It is a somatic reflex mediated predominantly by sympathetic nerve fibers. E. It is an exclusively voluntary action mediated by the cerebral cortex.
Another term for tissue fluid is:
a. plasma b. cytoplasm c. interstitial fluid d. blood
Polypeptide and glycoprotein hormones can be taken orally.
Answer the following statement true (T) or false (F)
Explain how the complementary strands of DNA are held together
A) They are held by ionic bonds. B) They are held by complementary base pairing; adenine to thymine and guanine to cytosine. C) They are held by complementary base pairing; adenine to cytosine and thymine to guanine. D) They are held by complementary base pairing; adenine to guanine and thymine to cytosine. E) They are held by complementary base pairing; adenine to adenine, thymine to thymine, guanine to guanine, and cytosine to cytosine.