The juxtaglomerular apparatus
a. is a combination of specialized tubular and vascular cells
b. secretes renin
c. produces substances involved in the control of kidney function
d. has only two of the above characteristics
e. has characteristics a, b, and c
E
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Endocrine cells
A) are a type of nerve cell. B) release their secretions onto an epithelial surface. C) release their secretions directly into body fluids such as blood. D) contain few vesicles. E) are modified connective tissue cells.
Which of the following is true of joints that are first-class levers?
A. The fulcrum is at the opposite end from the tendinous attachment. B. Their output force is always greater than the input force. C. Their mechanical advantage is always less than 1.0. D. Their resistance is between the fulcrum and the distal end of the bone. E. The fulcrum is in the middle.
Epinephrine causes
A. increased heart rate and stroke volume. B. vasoconstriction of blood vessels to the skin and viscera. C. vasoconstriction of blood vessels to skeletal muscle and heart muscle. D. all of these. E. increased heart rate, stroke volume and vasoconstriction of blood vessels to the skin and viscera.
Identify the regions of the spinal cord. Select all that apply.
a. Sacral b. Thoracic c. Lumbar d. Inguinal e. Cervical