The shortening velocity of a skeletal muscle fiber increases with decreasing load because the rate at which the cross-bridge cycle can occur increases with decreasing load.
Answer the following statement true (T) or false (F)
True
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Which of the following assists in moving venous blood back to the heart?
a. contraction of skeletal muscles b. one-way valves in the veins c. the changing pressure in the chest caused by breathing d. all of the above
The ____________________ is the largest artery in the body
Fill in the blank(s) with correct word
The adrenal medulla synthesizes catecholamines. The first enzyme in the catecholamine synthesis pathway enzyme, tyrosine hydroxylase, is stimulated by:
A. cortisol B. epinephrine C. norepinephrine D. acetylcholine E. nitric oxide
What is a main difference between the modes of action of peptide hormones and steroid hormones?
A. Peptide hormones bind to intracellular receptors, whereas steroid hormones bind to receptors on the cell surface. B. Peptide hormones act as second messengers, whereas steroid hormones bind to receptors in the cytosol. C. Peptide hormones bind to receptors on the cell surface, whereas steroid hormones act as second messengers. D. Peptide hormones bind to receptors on the cell surface, whereas steroid hormones bind to intracellular receptors. E. There are no differences; both act by binding to intracellular receptors.