Which of the following statements regarding regulation of local blood flow is true?
A. Increased levels of CO2 increase the contraction of precapillary sphincters.
B. Tissue need for O2 and amino acids will cause precapillary sphincters to contract.
C. Blood flow through capillaries is continuous.
D. Contraction of precapillary sphincters will increase blood flow to a capillary bed.
E. Increased metabolic rate in a tissue increases capillary blood flow into the tissue.
Answer: E
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The endocrine and nervous systems are similar in that
they release chemicals that bind to specific receptors on target cells they share some chemical messengers they attempt to maintain homeostasis Ony A and C are correct All of the choices correct
The fossa ovalis is a remnant of the ________ of the fetus
A) umbilical vein B) umbilical artery C) foramen ovale D) ductus venosus E) ductus arteriosus
The secretion of epinephrine and norepinephrine is controlled by ________.
A. a change of blood glucose level B. action potentials for the sympathetic part of the autonomic division C. a releasing hormone from the pituitary gland D. action potentials for the parasympathetic part of the autonomic division
The juxtaglomerular cells release the enzyme ________ when the macula densa cells detect low blood volume or solute concentration.
Fill in the blank(s) with the appropriate word(s).