In a human kidney, what is the function of the nephrons?
a. Forming urine
b. Sending urine to the ureter
c. Collecting urine
d. Signaling the urge to urinate
a. Forming urine
In a human kidney, the function of the nephrons is forming urine.
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An insertion sequence is distinguishable from other mobile genetic elements because
A. it encodes a transposase. B. it is composed of DNA. C. it is highly complex. D. it is smallest.
Which process involves antibodies covering surface receptors on a virus or toxin molecule, thereby disrupting their activity?
A. Neutralization B. Opsonization C. Complement fixation D. Agglutination E. Anamnestic response
When experimentally applying alpha-bungarotoxin to a muscle, you find that it does not contract when the motor neuron leading to it is electrically stimulated. Knowing that this toxin blocks acetylcholine receptors, what can you conclude about the failure to contract?
A. A contraction fails to occur because an action potential is not generated in the muscle cell. B. A contraction fails to occur because this toxin prevents cross-bridge formation and thereby directly prevents contraction. C. A contraction fails to occur because this toxin directly prevents calcium ion release from intracellular stores. D. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction. E. A contraction fails to occur because acetylcholine is not released from the motor neuron.
Complement activation results in ALL of the following EXCEPT
a. membrane lysis. b. antibody production. c. lysis of target cell. d. enhanced phagocytosis.