Which structure secretes renin?
A. Juxtaglomerular apparatus
B. Distal convoluted tubule
C. Posterior pituitary gland
D. Hypothalamus
Answer: A
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The concentrations of two substances are increasing outside the cell. For substance A, transport into the cell increases proportionally as the concentration outside increases. For substance B transport into the cell increases but then levels off despite the concentration outside continuing to increase. What is the explanation for this?
A. Saturation B. Affinity C. Competition D. Specificity
Under certain conditions, the vocal folds act as a sphincter that prevents air passage
Indicate whether the statement is true or false
Which statement about neural reflex arcs is incorrect?
A) They contain the following elements: receptor, integrating center, and effector. B) An afferent path leads to the integrating center and an efferent path leads away from it. C) They are slowed down by the hormones involved. D) Their function is to protect the body from harm caused by homeostatic imbalances or external events.
Which T cell toxin fragments DNA?
a) Perforin
b) Tumor antigen
c) Interferons
d) Lymphotoxin
e) Toxin T