Explain the three types of stimuli that regulate hormone secretion
What will be an ideal response?
First, some endocrine cells increase or decrease their secretion in response to other hormones. These hormones are regulated by hormonal stimuli. Second, many endocrine cells respond to the concentration of a certain ion or molecule in the blood or extracellular fluid. These endocrine cells are regulated by humoral stimuli. Third, some cells respond to signals from the nervous system. These cells release neurohormones in response to neural stimuli.
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Which target organ receives dual innervation?
A) small intestine B) kidney C) sweat glands D) coronary blood vessels
Electrical signals pass between cardiomyocytes through the ________.
A. gap junctions B. hemidesmosomes C. desmosomes D. tight junctions
Which valve prevents the backflow of blood into the left ventricle when the ventricles relax?
A. Right atrioventricular valve B. Aortic semilunar valve C. Left atrioventricular valve D. Pulmonary semilunar valve E. None of the choices is correct.
The muscles that are found at openings of the body are collectively called ________.
A) convergent muscles B) circular muscles C) parallel muscles D) divergent muscles