Codons are part of ______.
A) tRNA.
B) rRNA.
C) mRNA.
D) proteins.
C) mRNA.
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A marathon runner was perspiring heavily. Which function of sweat was occurring?
A. Absorbing heat into the body B. Absorbing enzymes into the body C. Releasing heat from the body D. Releasing enzymes from the body
The sympathetic postganglionic axons from the superior cervical ganglion innervate
a: Sweat glands in the head b: Sweat glands in the palms c: Smooth muscle of blood vessels in the head d: Smooth muscles of blood vessels in the antebrachial region e: Superior tarsal muscle of the eye f: Submandibular salivary gland A. a, c, e B. b, d, f C. a, c, f D. d, e, f E. b, d
The function of the ventricular conduction system of the heart is to
a. spread of the action potential throughout the large ventricular mass to ensure a single, coordinated contraction of the ventricles. b. spread the action potential in the absence of sympathetic stimulation. c. set the heart rate. d. spread the action potential throughout the atria and ventricles. e. slow down the original action potential so it has time to spread throughout the large ventricular mass.
What hormone increases excretion of sodium?
A) ADH B) aldosterone C) angiotensin II D) atrial natriuretic peptide E) parathyroid hormone