Which of the following is an example of a negative feedback system?
a. during labor, uterine contractions stimulate the release of oxytocin, which strengthens the contractions of smooth muscle in the uterine wall
b. a decrease in blood pressure and heart function during severe blood loss
c. formation of a blood clot (a scab) after a person has received a cut to the arm
d. scratching at the itchy skin rash, which makes the rash spread and itch even more
e. none of these are examples of negative feedback
e. none of these are examples of negative feedback
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The autonomic nervous system controls all of the following except the __________.
A. adrenal gland B. smooth muscle in the walls of the aorta C. cardiac muscle in the right atrium D. skeletal muscle in the rectus abdominis E. parotid salivary gland
Contraction of the dartos muscle
A) elevates the scrotal sac. B) produces an erection. C) propels sperm through the urethra. D) moves sperm through the ductus deferens. E) initiates seminal emission.
Dietary ________________________________________ is essential to the absorption of fat-soluble vitamins
Fill in the blank(s) with correct word
Tooth ________________________________________ is the hardest substance in the body
Fill in the blank(s) with correct word