Which of the following is not true of electrical synapses?
A. Ions diffuse directly from one cell to the next.
B. Adjacent cells are joined by gap junctions.
C. They are useful for integrating information and making decisions.
D. Cardiac muscle cells are joined by such synapses.
E. They facilitate quick transmission of signals.
C. They are useful for integrating information and making decisions.
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What structures control blood flow into capillary beds?
A. Precapillary sphincters B. Arteriovenous shunt C. Semilunar valve D. Adhesion junctions
All of the following are interactions between cell mediated immunity and innate immunity, except
A. Macrophage of innate immunity present antigens to helper T cells. B. Cytokines secreted by helper T cells stimulate inflammation. C. Cytokines secreted by helper T cells stimulate phagocytosis. D. Macrophages of innate immunity present antigens to cytotoxic T cells.
The ductus deferens
A. travels through the bladder. B. passes just beneath the skin to the penis. C. ascends the abdominal cavity along the posterior side of the kidney. D. stores sperm cells until ejaculation. E. passes through the inguinal canal and enters the pelvic cavity.
A system in which blood circulates through two capillary beds before returning to the heart is called a(n)
A) circulating system B) portal system C) sinus D) anastomosis