Which of the following binds to a specific receptor and initiates a response in a cell?
A)G protein
B)Ligand
C)Protein kinase
D)Cyclic AMP
B)Ligand
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Select the correct statement about the hormonal events of the ovarian cycle
A) The LH surge stimulates further development of the secondary oocyte. B) High estrogen levels result in a surge of LH release. C) The follicle begins to secrete progesterone in response to estrogen stimulation. D) Rising levels of estrogen start follicle development.
Movement in the anterior-posterior plane that decreases the angle between articulating bones is which movement?
A) flexion B) hyperextension C) elevation D) retraction E) protraction
A function of tropomyosin is
a. to bind Ca2+ b. to form attachments with myosin cross bridges c. to prevent myosin cross bridges from attaching to the thin filaments d. to act as an ATPase e. none of the above
Tubular reabsorption and tubular secretion differ in that
A. tubular secretion is a passive process; tubular reabsorption uses active transport. B. tubular reabsorption occurs in Bowman capsule; tubular secretion occurs in the peritubular capillary. C. tubular reabsorption increases urine volume; tubular secretion decreases urine volume. D. tubular secretion adds materials to the filtrate; tubular reabsorption removes materials from the filtrate. E. tubular secretion moves materials from the filtrate into the blood; tubular reabsorption moves materials from the blood into the filtrate.