Which of the following terms is mismatched with its description?
A. Chordae tendineae - connective tissue strings that connect to cusps of valves
B. Pectinate muscles - muscles that close valves
C. Trabeculae carneae - found on the interior walls of ventricles
D. Endocardium - covers the inner surfaces of the heart
E. Myocardium - cardiac muscle
Answer: B
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Emission
A) depends on waves of contractions of the preputial glands. B) begins with peristaltic contractions of the ductus deferens. C) is responsible for propelling spermatozoa into the female reproductive tract. D) involves contractions of the cremaster muscle. E) is associated with orgasm.
________ gland is important in regulating the blood glucose
A) Thymus B) Pineal C) Thyroid D) Pancreas
Cardiac muscle cells and skeletal muscle cells differ in a few ways. Which of the following is not one of them?
A) Cardiac muscle cells are smaller in size. B) Cardiac muscle cells have a single, centered nucleus. C) Cardiac muscle cells branch. D) Skeletal muscle cells lack intercalated discs. E) Cardiac muscle cells lack transverse tubules.
Cells that respond to peptide hormones usually do so through a sequence of biochemical reactions involving receptor and kinase activation. In order for cells to respond, it is necessary for first and second messengers to communicate
This is possible because ________. A) peptide hormones are converted by cell membranes enzymes into second messengers B) G protein acts as the link between first and second messengers C) the hormone receptor complex moves into the cytoplasm as a unit D) hormones alter cellular operations through direct stimulation of a gene