Topic 8 - endocrine system
- Created by: Charp3
- Created on: 28-02-23 10:18
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- Topic 8 -Endocrine System
- 8.1.1 Location of major Endocrine organs
- Hypothalamus
- Releases Neurohormones - GHRH
- Pituitary gland
- Regulates growth - Growth hormone
- Pineal gland
- Sleep cycle - Melatonin
- Thyroid gland
- Regulation of weight and energy - triiodothyronine (T3) and thyroxine (T4).
- Adrenal gland
- Fight or flight response - adrenaline
- Pancreas
- Regulate blood sugar levels - Insulin, Glucagon
- Ovaries and testies
- Sex hormones
- Hypothalamus
- 8.1.2 - Circulating and local hormones
- Hormones secreted by endocrine glands
- Regulate and coordinate bodily functions
- Release in short bursts
- Some over longer periods of time for permanent changes
- Hormones affect specific target cells
- Chemically binding to specific receptors
- Circulating hormones travel in the blood
- e.g. adrenaline and testoterone
- Local hormones act on neighbouring cells
- Do not enter the blood stream, inactivated quickly
- e.g. Glucagon and serotonin
- Do not enter the blood stream, inactivated quickly
- Hormones secreted by endocrine glands
- 8.1.3 How circulating hormones are regulated
- Regulated by complex (negative) feedback loops
- Signals from the nervous system, such as adrenaline
- Chemical changes in the blood, such as insulin
- Other hormones, such as growth hormone
- Regulated by complex (negative) feedback loops
- Relationship between hypothalamus and pituitary gland
- Together responsible for homeostasis
- Hypothalamus is the part of the brain that controls the pituitary gland
- Pituitary gland is an endocrine gland
- Neurohormones (GHRH) and somatostatin from the hypothalamus, influence the pituitary gland
- Nerve impulses from the hypothalamus stimulate the pituitary gland
- Pituitary gland secrets hormones such as ADH and GH, that help regulate bodily functions
- Together responsible for homeostasis
- 8.1.1 Location of major Endocrine organs
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