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Hormones

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by

Connor Lee

on 8 March 2017

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Transcript of Hormones

Hormones, control + plant hormones.
Hormones
Hormones are like messengers to tell parts of the body what to do, they travel in the blood.

•In women, FSH helps control the menstrual cycle and the production of eggs by the ovaries. The amount of FSH varies throughout a woman's menstrual cycle and is highest just before she releases an egg (ovulates).
•In men, FSH helps control the production of sperm. The amount of FSH in men normally remains constant.

In females, an acute rise of LH triggers ovulation and development of the corpus luteum.


Hormone control
Most endocrine glands are under negative feedback control that acts to maintain homeostasis, i.e., prevent deviation from an ideal value. A key example of a negative feedback system is the regulation of the thyroid hormone thyroxine, which regulates numerous key metabolic processes.
Plant hormones
3 plant hormones: auxin, gibberellins, ethene.

Ethylene serves as a hormone in plants. It acts at trace levels throughout the life of the plant by stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves.
Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.
Gibberellins (GAs) are plant hormones that regulate growth and influence various developmental processes, including stem elongation, germination, dormancy, flowering, sex expression, enzyme induction, and leaf and fruit senescence.
Definitions
Endocrine - relating to or denoting glands which secrete hormones or other products directly into the blood.

Homeostasis - the tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes
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