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Презентация на тему Endocrine system
Содержание
- 2. Endocrine system regulates and coordinates the body and body activities.Endocrine system is composed of endocrine glands.
- 4. Hormones are substances secreted (released) by cells
- 5. Functions of hormones 1. Regulating growth, development, behavior,
- 6. Target cellA target cell is a specific
- 8. Target organsSome of hormones may affect one
- 9. The regulation of hormone secretionFeedback mechanisms (механизм
- 11. If blood calcium level increases, the secretion
- 12. Скачать презентацию
- 13. Похожие презентации
Endocrine system regulates and coordinates the body and body activities.Endocrine system is composed of endocrine glands.
Слайд 4
Hormones are substances secreted (released) by cells that
act to regulate the activity of other cells in
the body.Hormones act as chemical messengers, carrying instructions that cause cells to change their activities
Слайд 5
Functions of hormones
1. Regulating growth, development, behavior, and
reproduction
2. Coordinating the production, use, and storage of energy
3.
Maintaining homeostasis4. Responding to stimuli from outside the body
Слайд 6
Target cell
A target cell is a specific cell
that a hormone binds to and acts on (carries
the message to).A hormone recognizes a target cell because the target cell has specific receptors.
A hormone binds only to cells that have a particular receptor protein, ignoring all other cells.
Слайд 8
Target organs
Some of hormones may affect one type
of cell, others may affect many cells or tissues.
EXAMPLE:Target organs of pituitary (гипофизарный) hormones are the ovaries.
Target organ of growth hormone is all the tissues of the body.
Слайд 9
The regulation of hormone secretion
Feedback mechanisms (механизм обратной
связи) play important role in the regulation:
NEGATIVE
POSITIVE
Ex: parathyroid hormone
stimulates the release of calcium into the blood affecting bone tissue.Слайд 11 If blood calcium level increases, the secretion of
parathyroid hormone decreases, this is negative feedback.
If calcium level
decreases, the secretion increases, this is positive feedback.Bone Tissue
