Why is venous blood more acidic than arterial blood?
What will be an ideal response?
Answer: Venous blood contains more carbon dioxide than arterial blood because the tissues produce carbon dioxide, and carbon dioxide is lost at the lung. Carbon dioxide dissolves in blood to form carbonic acid, which dissociates to form bicarbonate and protons, lower the pH.
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Answer the following statements true (T) or false (F)
1. A precapillary sphincter is a cuff of smooth muscle that regulates the flow of blood into the capillaries. 2. The carotid sinus reflex protects the blood supply to the brain, whereas the aortic reflex is more concerned with maintaining adequate blood pressure in the systemic circuit as a whole. 3. Vasodilation is a widening of the lumen due to smooth muscle contraction. 4. The pulmonary circulation does not directly serve the metabolic needs of body tissues. 5. The most common form of shock is hypovolemic shock.
A baby holding its breath will
A. be termed a "blue baby". B. suffer heart damage because of increased pressure in the aorta. C. have brain cells damaged because of low blood oxygen levels. D. automatically start to breathe when oxygen levels decrease slightly. E. automatically start to breathe when the CO2 levels in the blood reach a high enough value.
The chamber of the heart forming the apex is the ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a normal response to excessive loss of body heat in a cold
environment? A) Dermal blood vessels dilate. B) Dermal blood vessels constrict. C) Smooth muscles relax. D) Sweat glands become active.