In a sandstorm, which of the following muscles would protect the eyes, by closing the eyelids?
A. Superior oblique and inferior oblique
B. Superior rectus and inferior rectus
C. Lateral rectus and medial rectus
D. Levator palpebrae superioris
E. Orbicularis oculi
Answer: E
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What is the significance of the presence of two sets of veins, one superficial and the other deep, in the neck and extremities?
A) There is no known significance for this phenomenon. B) This placement is important in the regulation of the distribution of hormones in the circulation. C) This distribution is important for regulation of body temperature. D) These vessels have a completely different distribution and so must be located far from one another. E) All of the answers are correct.
Describe the controls over secretion of minero- and gluco-corticoids
What will be an ideal response?
Which of the following statements about DNA replication is TRUE?
The leading strand is replicated continuously, while the lagging strand is replicated discontinuously. The leading strand is replicated discontinuously, while the lagging strand is replicated continuously. Both the leading and lagging strands are replicated continuously. Both the leading and lagging strands are replicated discontinuously. Each of the leading and lagging strands is replicated both continuously and discontinuously.
The plateau portion of the action potential in contractile cardiac muscle cells is due to:
A. an increased potassium permeability. B. an influx of calcium ions. C. an influx of sodium ions. D. exit of calcium ions from the sarcoplasmic reticulum.