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Endocrine System

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It releases hormones into the blood to signal other cells to behave in certain ways. It is a slow but widespread form of communication. Endocrine glands Release ... – PowerPoint PPT presentation

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Title: Endocrine System


1
Endocrine System
  • Year 9 Science

2
Endocrine system
  • It releases hormones into the blood to signal
    other cells to behave in certain ways.
  • They are chemicals that are released slowly from
    different glands throughout the body.

3
Interaction of Glands
  • The hypothalamus is located in the brain and
    controls the release of hormones from the
    pituitary gland.
  • It is an important link between the endocrine and
    nervous systems.

4
Hormones
  • Hormones are chemical substances that usually act
    as messengers in the body.
  • Hormones are made by endocrine glands and
    released into the bloodstream or the fluid
    surrounding cells and send signals to target
    organs.
  • They are slower to act than the nervous system

5
Pituitary Gland
  • Located at the base of the brain It secretes nine
    hormones that regulate many body functions and
    controls functions of other glands.
  • It's often called the "master gland.

6
Thyroid
  • The thyroid is located in the neck, just below
    the Adams apple
  • It is controlled by hormones from the pituitary.
  • It produces the hormone thyroxin which is
    involved in controlling metabolism, heart rate,
    heat regulation, and brain development.

7
The Adrenal Glands
  • The body also has two triangular adrenal glands,
    one on top of each kidney.
  • It controls the rate at which your heart beats
    and your breathing due.
  • It secretes the hormone adrenaline which
    increases your heartbeat and breathing when your
    frightened or nervous.
  • It provides a
  • fight or flight response

8
Pancreas
  • The pancreas produces two important hormones,
    insulin and glucagon.
  • These hormones together maintain a steady level
    of glucose, or sugar, in the blood.

9
Female Gonads Ovaries
  • Produce ova (eggs) and secrete the female
    hormones estrogen progesterone.
  • Estrogen is involved in beginning puberty
  • Estrogen and progesterone are also involved in
    the regulation of a girl's menstrual cycle. These
    hormones also play a role in pregnancy.

10
Males Gonads - Testes
  • The male gonads, or testes are located in the
    scrotum.
  • They secrete hormones called androgens, the most
    important of which is testosterone.
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