Answer:
Atelectasis is a condition in which all or part of a lung becomes airless and collapses. Blockage of the bronchial tubes is a common cause of atelectasis. Shortness of breath can develop if oxygen levels are low or pneumonia occurs.
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Answer:
The answer is B: All the muscle cells innervated by a single motor neurorn.
Explanation:
It is called a motor unit, all muscle fibers that are innervated by a motor neuron cell. A motor neuron cell can establish contact with up to 150 muscle fibrils, which when activated causes their simultaneous contraction, therefore, all the muscle fibers of a motor unit contract and relax at the same time.
Answer:
A. Inhibit FSH secretion.
Explanation:
Inhibin is a hormone secreted by the granulosa cells in the ovaries of women and the Sertolli cells in men. The main function of inhibin, as they name says, is to inhibit the secretion of FSH by the anterior pituitary gland. Inhibin is also produced by the Sertolli cells in the testes of men, and it is released in the blood when the sperm count is too high. FSH causes the Sertoli cells of the testes to begin the process of spermatogenesis in the testes. Therefore, releasing inhibin would cause a negative feedback and stop the production of sperm.
Answer: Option C.
Explanation:
The female reproductive part consist of endometrium which is the inner epithelial layer with a mucous membrane in the uterus.
Endometrium functions as basic layer during the period of menstruation.
In female reproductive part, an egg is released from ovary around every fourteenth day in a cycle depending on hormonal changes that makes the endometrium layer thick. endometrium lining provides nutrients to an embryo after implantation, when the egg does not get fertilized, the endometrium lining shed during menstruation along with some blood vessels.
Hence, the correct answer is option C.
