Immunity that results from exposure to an antigen in the environment is called ________ immunity
A) naturally acquired active
B) naturally acquired passive
C) artificially acquired active
D) artificially acquired passive
E) innate
A
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Why do people who have a heart attack often experience pain radiating along the left shoulder and arm?
A. Signals from nociceptors in the heart diverge and stimulate pain sensations in a large region. B. Signals from the cardiac and shoulder region converge and follow the same pathway to the cortex. C. Nociceptors from the cardiac and shoulder regions all send afferent signals through the phrenic nerve. D. Nociceptors from the cardiac and shoulder regions all send afferent signals through the vagus nerve. E. Lack of blood to the left shoulder and arm result in ischemia and stimulates nociceptors in those regions.
Which of the following is not a factor that increases risk of developing atherosclerosis?
A) Low blood pressure B) A diet high in unsaturated fats C) Tobacco smoking D) Lack of physical exercise
Phospholipids are able to form bilayer membranes in aqueous environments because
a. they have hydrophobic heads and hydrophilic tails. b. they have polar heads and nonpolar tails. c. they have polar tails and nonpolar heads. d. the phospho-portion can form phosphodiester bonds between adjacent phospholipids. e. two of these.
Which of the following is a feature that distinguishes active transport from facilitated diffusion?
A. saturation of transport rate B. requirement for a carrier molecule C. carrier molecules have specificity D. presence of a transport maximum E. requirement for metabolic energy