Which phases of a heartbeat shown in the diagram involve repolarization of the heart's four chambers?
a) 1 and 4
b) 2 and 4
c) 4 and 6
d) 1, 3, and 5
e) 1, 2, 4 and 6
f) 3 and 5
f
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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.
An individual water molecule contains ______ atoms and enters into ______ hydrogen bonds with other water molecules.
A. two; two ?B. three; two ?C. three; three ?D. three; four ?E. three; six
Intracellular signaling pathways within target cells are organized such that
A. each step allows for amplification of the signal where one molecule can activate many. B. each step involves one molecule activating or synthesizing exactly one other molecule for precise control. C. enzymes are used up and degraded after each individual reaction they catalyze.
Sorting and directing the finished products to their final destinations is basic function of the . Golgi stack
Indicate whether the statement is true or false