The plasma membranes of the digestive system's effector cells have receptor proteins that bind with and respond to GI hormones, neurotransmitters, and local chemical mediators
a. True
b. False
Indicate whether the statement is true or false
True
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The surface of immune system ____ contains receptors for a variety of central nervous system chemical messengers.
A. sex hormones growth B. hormones catecholamines C. lymphocytes D. antibodies
When our inner ears convert sound energy into neural impulses or our retinas convert light into neural impulses,
A. it is consistent with the second law of thermodynamics, but an exception to the first. B. the conversion is consistent with both laws of thermodynamics. C. no heat is generated, and so it is an exception to the first law of thermodynamics. D. it is an exception to both laws of thermodynamics, because no usable energy is lost.
The semilunar valves are forced open when ________
A) ventricular diastole begins B) ventricular pressure exceeds the pressure in the large arteries leaving the heart C) atrial contraction occurs D) ventricular systole begins
During the intestinal phase regulating gastric function, ________.
A. gastric emptying is inhibited B. gastric gland secretions are inhibited C. stomach distension stimulates acid secretion D. the vagus nerve stimulates gastrin secretion