T cells undergo positive selection in the thymus, which means they ________
A) develop surface antigen receptors
B) die and macrophages phagocytize them
C) remain alive but unresponsive
D) react against self antigens
E) multiply and form clones of identical T cells
E
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The ICF contains about ____ of the total water of the body
a. 1/10 b. 1/4 c. 1/2 d. 2/3 e. 5/6
Describe the distribution of total blood volume in the body
A) The volume is divided into the systemic venous system (13%), systemic arterial system (64%), in the heart (7%), pulmonary circulation (9%), and systemic capillaries (7%). B) The volume is divided into the systemic venous system (64%), systemic arterial system (13%), in the heart (7%), pulmonary circulation (9%), and systemic capillaries (7%). C) The volume is divided into the systemic venous system (20%), systemic arterial system (20%), in the heart (20%), pulmonary circulation (20%), and systemic capillaries (20%). D) The volume is divided into the systemic venous system (75%), systemic arterial system (5%), in the heart (5%), pulmonary circulation (5%), and systemic capillaries (10%). E) The volume is divided into the systemic venous system (50%), systemic arterial system (37%), in the heart (7%), pulmonary circulation (3%), and systemic capillaries (3%).
The chief force pushing water and solutes out of the blood across the filtration membrane is ________
A) the ionic electrochemical gradient B) glomerular hydrostatic pressure (glomerular blood pressure) C) protein-regulated diffusion D) the size of the pores in the basement membrane of the capillaries
What is the purpose of surfactant that lines each alveolus?
A. Gives the lungs their elasticity B. Increases the surface tension of water C. Keeps the alveoli from collapsing