Which of the following statements concerning control of blood flow through arterioles is TRUE?
A. Beta-adrenergic receptors are more abundant on most arteriolar smooth muscle than are alpha-adrenergic receptors.
B. Body-wide constriction of arterioles results in a decrease in the total peripheral resistance (TPR).
C. Binding of epinephrine to alpha-adrenergic receptors causes vasodilation.
D. If the arterial blood pressure to an organ suddenly decreases, arterioles in the organ will dilate in response.
E. Increased stimulation of vascular smooth muscle by the parasympathetic nervous system causes increased vasoconstriction.
Answer: D
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A blastomere is a ________ and a blastocyst is ________.
A. cell produced by cleavage; a hollow ball of cells B. fetal membrane; an embryonic membrane C. hollow ball of cells; a cell resulting from cleavage D. fetal organ produced by cleavage; an embryonic organ produced by cleavage
All of the following are major types of membrane EXCEPT ________
A) mucous B) integument C) serous D) synovial
As a fetus develops beyond the fifth month, its skin is covered by a white, greasy substance called
A. lanugo. B. amnion. C. meconium. D. vernix caseosa.
What is the function of the middle cerebellar peduncles?
A. They contain neurons that produce dopamine. B. They carry signals between the cerebellum and the medulla oblongata. C. They carry signals between the cerebellum and pons. D. They carry signals between the cerebellum and midbrain. E. They contain neurons that monitor body position and movement.