Which of the following occurs as a result of positive feedback and assists in the maintenance of homeostasis?
A. Blood clot formation
B. Blood cell production
C. Blood pH regulation
D. Body temperature regulation
Answer: A
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You've been sitting cross-legged on the floor of your dorm room while studying. As you stand up to go get a snack, you realize that you've lost feeling in one of your feet. A minute later, all feeling is restored. Being a physiology student, you understand that blood flow was occluded during the time that you were sitting, and that blood flow was restored as you stood up. What else is TRUE?
A. The resistance of the blood vessels did not change from sitting to standing, but gravity helped in blood flow. B. High levels of built up CO2 acted as vasoconstrictors in the foot's blood vessels. C. The decreased oxygen content of the foot tissues and the increased levels of metabolic wastes both acted as vasodilators, increasing the flow of blood through the tissues upon standing. D. As you stood, vasoconstriction occurred in the foot's blood vessels to protect them from shock. E. All of these are true.
Fear can result in
A) increased stimulation of the cardioinhibitory center by higher brain centers. B) increased stimulation of the cardioacceleratory center by higher brain centers. C) decreased heart rate. D) decreased blood pressure. E) parasympathetic stimulation.
The ________ is the vessel from which venous blood samples are typically collected.
A) basilic vein B) median cubital vein C) brachial vein D) radial vein E) ulnar vein
Receptors
a. may be either a specialized ending of an afferent neuron or a special cell closely associated with the peripheral ending of an afferent neuron. b. are present for every modality in the environment. c. when stimulated bring about opening of Na+ channels in the afferent neuron membrane adjacent to the receptor. d. two of these answers. e. all of these answers.