Metabolically active tissues have which of the following sets of conditions that shift the oxyhemoglobin dissociation curve to the right?
A) ? PO2, ? PCO2, ? temperature, ? BPG B) ? PO2, ? PCO2, ? temperature, ? BPG
C) ? PO2, ? PCO2, ? temperature, ? BPG D) ? PO2, ? PCO2, ? temperature, ? BPG
B
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The hardness of a nail comes from
A. collagen. B. keratin. C. calcium. D. carotene.
If the sodium-potassium pumps in the plasma membrane fail to function, all of the following occur except
A) the intracellular concentration of potassium ions will increase. B) the neuron will slowly depolarize. C) the membrane will slowly lose its capacity to generate action potentials. D) the inside of the membrane will have a resting membrane potential that is more positive than normal. E) the intracellular concentration of sodium ions will increase.
Which STD is characterized by having a primary, secondary, and latent stage?
A. Syphilis B. HIV C. HPV D. Gonorrhea
Autorhythmicity in the heart is the responsibility of:
A) contractile cells. B) cardiac pacemaker cells. C) smooth muscle cells. D) skeletal muscle cells.