Implantation of the blastocyst into the uterine wall is correlated with the degeneration of the corpus luteum.
Answer the following statement true (T) or false (F)
False
The corpus luteum secretes progesterone and some estradiol. Progesterone inhibits LH and FSH secretion, and it further prepares the uterus for receiving and nourishing the embryo. If fertilization of the secondary oocyte does NOT occur, the corpus luteum degenerates after 2 weeks, allowing LH and FSH to initiate development of a new set of oocytes. However, if fertilization does occur, the blastocyst develops a surrounding layer of cells that secrete an LH-like hormone, called chorionic gonadotropin, which maintains the corpus luteum and its ability to secrete progesterone.
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The dominant physical resources from the sea are:
a. magnesium and iron. b. salt and water. c. gold and copper. d. sulfides and manganese. e. gold and oxygen.
Refer to Figure 29-2. The structure labeled 11 is:
a. a zygote.
b. a gamete.
c. a sporangium.
d. a zoosporangium.
e. a zoospore
During inspiration, the diaphragm __________ and __________ the volume of the thoracic cavity, causing air to flow __________.
a. relaxes; increases; inward b. contracts; increases; inward c. relaxes; decreases; outward d. relaxes; decreases; inward e. contracts; decreases; inward
Microbiologists interested in parasites study multicellular (algae/fungi/helminths) as well as single-celled protozoa.
Fill in the blank(s) with the appropriate word(s).