SECTION 3 OF 4 QUESTION 3078
ASSIGNMENTS
COURSES
Assignment - 15. Circulatory System
Attempt 3 of 3
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The upper part of the body returns blood to the heart through the pulmonary vena cava. The lower part of the body
returns blood to the heart through the inferior
vena cava
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is in the form atp or adenosine triphosphate

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."

if you know your abc's you should be able to get your answer or just use google