The cell cycle : principles of control by David O. Morgan

By David O. Morgan

Mobile department is a crucial organic procedure: it yields the cells required for improvement and development, and provides the alternative cells to fix and keep outdated or broken tissue. This booklet presents an outline of the method of phone department - from chromosome department, via mitosis, cytokinesis, and meiosis. 1. The telephone cycle -- 2. version organisms in cell-cycle research -- three. The cell-cycle regulate method -- four. Chromosome duplication -- five. Early mitosis : getting ready the chromosomes for segregation -- 6. meeting of the mitotic spindle -- 7. The finishing touch of mitosis -- eight. Cytokinesis -- nine. Meiosis -- 10. keep an eye on of telephone proliferation and development -- eleven. The DNA harm reaction -- 12. The mobile cycle in melanoma

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The variation in breast size and shape is due mostly to differences in the amount and distribution of fat; breast size does not affect the ability to secrete milk. 13). The latter tissue (suspensory ligaments of Cooper) provides support for the breast, but it tends to be less effective in older women. 14). The alveolus is the functional unit of the mammary gland. It is a hollow sphere of milk-secreting cells. Each alveolus receives an extensive blood supply, which provides raw materials for milk synthesis and transports the hormones that control alveolar growth and function.

ADULT FEMALE AND MALE REPRODUCTIVE SYSTEMS 42 2. THE FEMALE REPRODUCTIVE SYSTEM secreted in the breasts. It provides nutrients and protects the infant against certain infections, especially those of the digestive tract (see Chapter 12). Suckling Chapter 12 describes how suckling of the nipple maintains prolactin secretion, which causes milk secretion in previously primed mammary tissue. We also see how nursing stimulates the release of oxytocin, which causes ejection of milk from the nipple. 14).

2). It functions as a passageway for the menstrual flow, as a receptacle for the penis during coitus, and as part of the birth canal. The wall of the vagina has folds that allow it to stretch during coitus or childbirth; it is normally collapsed. The vaginal canal leads from the vulva (external genitalia) to the external cervical os. The opening of the external cervical os into the vagina is circumscribed by a recess called the fornix. This recess allows support for a diaphragm contraceptive (see Chapter 13).

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