Melanin is produced upon exposure to:
A) wind. B) UV radiation. C) heat. D) cold.
Answer: B
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Even though this structure is part of the circulatory system, it is included in the discussion of the urinary system
A) Proximal convoluted tubule B) Glomerulus C) Loop of Henle D) Renal pelvis
Answer the following statements true (T) or false (F)
1. In humans, melatonin may inhibit sexual maturation. 2. The antagonistic hormones that regulate the blood calcium level are calcitonin-parathormone. 3. The hormone that raises blood sugar levels is insulin. 4. Addison’s disease is due to a deficit output of glucocorticoids only. 5. Both "turn on" factors (hormonal, humoral, and neural stimuli) and "turn off" factors (feedback inhibition and others) may be modulated by the activity of the nervous system.
Select the correct statement about lymph transport
A) Under normal conditions, lymph vessels are very high-pressure conduits. B) Lymph transport is only necessary when illness causes tissue swelling. C) Lymph transport is faster than that occurring in veins. D) Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles.
What is the name of the tube that travels through the shaft of the penis?
A) membranous urethra B) prostatic urethra C) ureter D) spongy urethra