Page 42 - Science Course 2 (Book 1)

Mo2-L2b: What Can Help Maintain Homeostasis?

Let’s Begin The endocrine system coordinates organ systems
by using chemical signals called hormones.

Control and Coordination
Hypothalamus
The nervous system uses electrical Pineal
signals and helps organ systems of Glans Pituitary Gland
the body respond quickly to changes
in the internal and external Thyroid
environments. Gland Parathyroid

The body also uses the endocrine Thymus
system to help it respond to changes
and maintain homeostasis. Pancreas
Adrenal
Glands
The nervous system coordinates rapid
changes, and the endocrine system
coordinates slower responses. Testicle (Male)

The nervous system coordinates
the body’s response to external
stimuli. Ovary Female

For example, your pupils increase in size when you
enter a darkened room.

Hormones are secreted from endocrine organs
such as the thyroid gland, the adrenal gland, and the
pancreas.
Insulin, a hormone released from the pancreas,
works with the digestive system and maintains
energy homeostasis.
The nervous system Hypothalamus
also coordinates your – brain region controlling the Pituitary Gland
response to sight, smell,
touch, and taste. Pituitary Gland
–secretes many different hormones, some of which
affect other glands.
Neurons send electrical
signals to the brain for Parathyroids
processing so the – help regulate level of calcium in the blood
nervous system can
coordinate a response. Thyroid Gland
– affects metabolism among other things.

Ovary
–secretes female sex hormones
Testis(testicles)
– secretes male sex hormones
The nervous system has a rapid response system,
called a reflex, that reacts to stimuli without sending Adrenal Glands
information to the brain for processing. –help trigger the fight–or–flight response.

Pancreas
– regulates the level of sugar in the blood.
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