The cells of an alveolus that secrete surfactant are type ________.
Fill in the blank(s) with the appropriate word(s).
Answer: 2
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In the block to polyspermy, entry of the sperm's contents causes ________ levels in the oocyte's cytoplasm to rise, triggering the cortical reaction
A) calcium ion B) ATP C) phosphate ion D) sodium ion
Answer the following statements true (T) or false (F)
1. The corpus luteum is functioning as an endocrine gland during the proliferative phase of the female reproductive cycle. 2. The release of an egg by an egg follicle is called ovulation. 3. Ovulation always occurs 14 days after the end of menses. 4. The length of the reproductive cycle varies because the time between the end of menses and ovulation varies. 5. Progesterone stimulates proliferation and vascularization of the epithelial lining of the uterus.
The external environment is found outside the body
Indicate whether the statement is true or false
Most body cells are not in direct contact with the external environment
Indicate whether the statement is true or false