Which of the following does NOT influence the rate of diffusion of a chemical across a plasma membrane?
a) concentration gradient of the chemical across the membrane
b) mass of the diffusing chemical
c) distance that the chemical has to diffuse
d) amount of ATP available
e) temperature
Answer: d
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Some women prolong breastfeeding or lactation in general as a form of birth control. How would extension of lactation be effective in preventing pregnancy?
A. Lactation stimulates production of placental lactinogen, which is a pregnancy hormone and prevents the corpus luteum from degrading and advancing the reproductive cycle. B. The physical stimulation of breastfeeding causes high levels of progesterone to be produced, which cause secretions in the reproductive tract that are hostile to sperm. C. Prolactin is the hormone that corresponds with lactation. It also inhibits ovulation at the pituitary gland level, so as long as lactation is actively occurring, ovulation is prevented. D. Breastfeeding stimulates production of oxytocin, which causes the endometrium to slough off and exit the body in a menstrual period, preventing implantation of a zygote.
The visceral layer of the glomerular capsule is made of specialized cells called podocytes
Indicate whether the statement is true or false.
Hypokalemia results in membrane ____.
Select one: a. depolarization b. hyperpolarization c. hypopolarization
Which muscles form the outermost layer of the layered abdominal wall muscles?
A. Rectus abdominis B. External oblique C. External intercostal D. Internal oblique E. Transversus abdominis