NK cells secrete ________, which kills an abnormal cell by creating large pores in its plasma membrane.
A) histamine
B) pus
C) perforin
D) heparin
E) pyrogen
C) perforin
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Venous return would be increased by:
A. loss of venous valves B. decreased respiratory rate C. increased skeletal muscle activity D. dilation of the veins
Despite the fact that the partial pressure difference is so much smaller for CO2, why is there as much CO2 exchanged between the alveoli and blood as there is O2, ?
a) CO2 is much more soluble in blood than O2. b) The capillary walls are more permeable to CO2 than O2. c) CO2 is a smaller molecule and diffuses faster than O2.
People with type AB blood are considered the "universal recipient" for transfusions because
A) their blood cells lack A and B antigens. B) their blood lacks A or B antibodies. C) their blood is plentiful in A and B antibodies. D) they usually have very strong immune systems. E) they are usually Rh negative.
The left lung is larger than the right lung and is divided into three lobes
Indicate whether the statement is true or false