Cell X has a resting potential of -80 mV. If a ____ opens and causes the potential to change 10 mV, the resulting potential will be ____
a. Na+ channel; -90 mV
b. K+ channel; -70 mV
c. Ca2+ channel; -70 mV
d. Cl- channel; -70 mV
e. Ca+2 channel; -90 mV
D
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In which layer does one find numerous blood capillaries that supply oxygen and glucose to muscle cells?
A. Endomysium B. Perimysium C. Epimysium D. Sarcolemma E. Fascia
The cellular abnormality that causes cystic fibrosis is
A) abnormal potassium channels in heart muscle. B) absence of the ability to feel pain. C) abnormal chloride channels that trap salt inside cells lining the lung passageways. D) extra receptors for a growth factor.
Which of the following is not attributable to atrial natriuretic peptide (ANP)?
a. It is released from the cardiac atria when the ECF volume is reduced. b. It inhibits Na+ reabsorption in the distal parts of the nephron. c. It inhibits renin secretion by the kidneys. d. It inhibits aldosterone secretion by the adrenal cortex. e. It inhibits sympathetic nervous activity to the heart and blood vessels.
What are sinuses lined with?
A. Cartilage B. Connective tissue C. Mucous membranes D. Muscle