Explain the role of peripheral chemoreceptors in the maintenance of blood flow to tissues
What will be an ideal response?
Peripheral chemoreceptors, located in the carotid arteries and aorta, respond mostly to the level of oxygen in the blood. A significant decrease in blood oxygen concentration triggers a series of feedback loops that indirectly stimulate an increase in heart rate and cause vasoconstriction. Vasoconstriction causes an increase in peripheral resistance, blood pressure and the delivery of oxygenated blood to cells and tissues.
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The imaging technique that assesses metabolic and physiological activity of a structure is called a
A) PET scan. B) ultrasound. C) digital subtraction angiography. D) MRI. E) CT scan.
Infection of a sebaceous ciliary gland can result in
a) blood shot eyes. b) inhibition of tear production. c) a sty. d) glaucoma. e) blindness.
Hydrochloric acid keeps the stomach contents at a pH of
A) 6.5-8.0. B) 1.5-2.0. C) 4.5-6.0. D) 7.0. E) 3.5-5.0.
Some antibodies against foreign antigens can react to similar self-antigens, causing an autoimmune disease
Indicate whether the statement is true or false