In the pulmonary circulation, the ________ carry blood to the lungs.
A. carotid sinuses
B. coronary arteries
C. aorta
D. pulmonary arteries
E. superior vena cava and inferior vena cava
Answer: D
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Expanded blood volume stimulates stretch receptors in the atria of the heart, causing increased secretion of ________.
A. parasympathetic antagonists B. aldosterone C. atrial natriuretic peptide D. epinephrine
Which is true regarding the action of a neurolemmocyte?
A. Each neurolemmocyte can form a myelin sheath around many axons simultaneously. B. Neurolemmocytes function only within the CNS. C. A neurolemmocyte attacks pathogens. D. A neurolemmocyte is responsible for forming part of the blood-brain barrier. E. Each neurolemmocyte can wrap only a 1 mm portion of a single axon.
Regions of the CNS where neuron cell bodies dominate constitute the ________ matter
A) white B) grey C) clear D) dark E) yellow
Which of the following statements concerning the embryonic circulatory system is true?
A. The heart develops from four endothelial tubes. B. Blood vessels form from blood islands. C. An opening in the interatrial septum is called the sinus venosus. D. The bulbus cordis becomes the sinoatrial node (the adult pacemaker). E. There is an opening in the interventricular septum.