Hormones.

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Presentation transcript:

Hormones

Aims To know that our bodies are controlled by hormones. To understand that different hormones affect different parts of our bodies in different ways.

What is a hormone? Hormones are chemical messengers used in the body by the endocrine system. They co-ordinate our organs. Hormones are produced by glands.

Hormone controls. Hormones travel slower than nerve impulses but have a longer lasting effect. They are excreted by the glands and travel in the blood. Hormones stabilise the body's internal environment and also have roles in growth and sexual development.

Hormone controls. Hormones control: Growth Sexual development Sugar levels Mood Metabolism Can you think of any problems that can be caused by these not working?

Growth hormone problems?!

Endocrine glands. Pineal gland Pituitary gland Thyroid gland Thymus Adrenal gland Pancreas Ovary Testis

Hormone Regulation Hormones are regulated by negative feedback. Regulation of blood sugar is a good example of this.

Insulin Control Brain senses high blood sugar Pancreas produces Insulin Glucose stored in liver as glycogen Low blood sugar sensed by brain Pancreas produces glucagon Liver releases stored glycogen as glucose into blood