Action potentials pass from one cardiac muscle cell to another through areas of low electrical resistance called
A. sarcolemma sclerotic plaques.
B. gap junctions.
C. tight junctions.
D. electromagnetic discs.
E. fibrous heart rings.
Answer: B
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Gender determination for males reflects expression of
A. both the SRY and Wnt4 genes. B. the entire Y chromosome. C. the Wnt4 gene but not the SRY gene. D. the SRY gene but not the Wnt4 gene.
Which of the following statements concerning cerebrospinal fluid is incorrect? Cerebrospinal fluid
a. is formed by the choroid plexuses and is reabsorbed across the arachnoid villi into the blood within the dural sinuses. b. serves as a shock-absorbing fluid to cushion the brain against jarring movements. c. comes into direct contact with the neuronal and glial cells. d. fills the subarachnoid space. e. influences the composition of the brain interstitial fluid more than the blood does.
The region of the kidney located outside of the renal medulla is called the renal __________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following hormones is synthesized by the hypothalamus?
A. ADH (antidiuretic hormone) B. TSH (thyroid stimulating hormone) C. ACTH (adrenocorticotropic hormone) D. MSH (melanocyte stimulating hormone) E. T3 and T4