Biology A-level: Photosynthesis

May 20th, 2015
Studypool Tutor
Price: $10 USD

Tutor description

The carbon dioxide enters the plant by stomata (in the leaves) or lenticels (in the stem). The water enters through the roots and moves up through the plant in xylem vessels.

Word Count: 7936
Showing Page: 1/27
The cyclic changes in the ovary and uterus are under the control of estrogen and progesterone hormones whose secretion is under the control of gonadotropic hormones secreted by anterior pituitary.Hormonal Control of Menstrual Cycle in Human FemaleDuring menstrual phase the levels of estrogen and progesterone falls considerably.This induces adenohypophysis to secrete FSH and LH.Increased levels of FSH stimulates the graafian follicle to mature and secrete estrogens. The rising level of estrogen, causes the endometrium to become thicker and more richly supplied with blood vessels. The level of estrogens in blood increases gradually for a few days and is at the peak on the 12thday of the cycle.The estrogen surge reduces FSH secretion and this in turn introduces LH surge within 12 hours i.e., on the 13thday of the cycle.LH causes ovulation and formation of corpus luteum.During post ovulatory phase corpus luteum secretes progesterone.Corpus luteum secretes progesterone, which performs the following functions:a) It facilitates the preparation of the endometrium of the uterus for receiving the blastocyst and its implantation. (whether fertilisation occurs or not)b) It inhibits the contraction of the uterus and any further development of a new follicle.c) If fertilisation does not occur, the rising progesterone level inhibits the release of Gonadotropin releasing hormone (GnRH), which inturn inhibits the production of FSH, LH and progesterone.d) Once the progester

Review from student

Studypool Student
" <3 it, thanks for saving me time. "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1831 tutors are online

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors