To reduce brain swelling by pulling water out of brain cells, a substance can be injected intravenously to increase the osmotic pressure of interstitial fluid. Which of the following properties must this substance lack in order to be effective?
A) permeable to capillary endothelium
B) nontoxic to neurons
C) permeable to brain plasma membranes
D) impermeable to brain plasma membranes
E) soluble in water
C
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Extrasystole of the heart means that it
a. beats too slowly b. fills with too much blood c. has a complete block d. loses blood e. produces a premature beat
Mucous, sweat gland secretions, hairs, and sebaceous secretions all contribute to the effectiveness of which type of innate defense?
a. interferons b. pyrogens c. physical barriers d. complement
Which of the following types of neurons serves as motor neurons for voluntary and involuntary movements?
A) bipolar neurons B) anaxonic neurons C) unipolar neurons D) multipolar neurons
Describe the structure of an antibody. What type of molecule is it? What is its shape, how many parts does it have, and how do the parts differ?
What will be an ideal response?