A family of peptides called ________ are released by the endothelium and are among the most potent vasoconstrictors known.
Fill in the blank(s) with the appropriate word(s).
endothelins
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Which of the following correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction?
a) sarcolemma, axon of neuron, T tubules b) T tubules, sarcolemma, myofilament c) muscle fiber, axon of neuron, myofibrils d) axon of neuron, sarcolemma, T tubules e) myofibrils, myofilaments, mitochondria
Oral contraceptives prevent ovulation primarily by suppressing gonadotropin secretion
Indicate whether the statement is true or false
Potassium secretion is regulated by
A) aldosterone. B) angiotensin I. C) renin. D) atrial natriuretic peptide (ANP). E) parathyroid hormone (PTH).
Which bone is not paired?
A. Maxilla B. Nasal C. Mandible D. Lacrimal E. Zygomatic