The Endocrine System
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Transcript The Endocrine System
The Endocrine
System
Functions:
Controls the conditions in your body
by making and sending chemicals
from one part of the body to another
This is called_____________
Most responses are controlled by the
nervous system
Hormones:
Chemicals that are made in one organ
and travel through the blood to a
second organ
Second organ (target organ) responds
to the chemical
Different hormones perform different
jobs
Glands
Main structures of the endocrine
system
Main organs
Produce hormones and release them
into the circulatory system
Pituitary Gland
“Director” of the system
Produces hormones that control:
Growth
Sexual development
Absorption of water into the
blood by the kidneys
Hypothalamus
Attached to the pituitary gland
Primary connection between nervous
and endocrine systems
Secretions of the pituitary gland are
controlled here
Produces releasing hormones
Pineal Gland
Sensitive to different levels of light
Essential to rhythms such as sleep,
body temperature, reproduction and
aging
Thyroid Gland
Releases hormones for growth and
metabolism
Stores the thyroid hormone
Produces calcitonin
Helps regulate calcium in the body
Thymus
Helps body fight disease by
controlling the production of white
blood cells (t-cells)
Adrenal Glands
Secrete 30 different hormones that
regulate carbohydrate, protein and fat
metabolism and water and salt levels
in your body
Fights allergies and infections
Produces adrenaline
Makes your heart beat faster
Relaxes the muscles in the lungs
Pancreas
Secretes 2 hormones
Insulin
Glucagon
Regulates the level of glucose in your
body
Diabetes
Type I and Type II
Ovaries and Testes
Secrete hormones that control sexual
development
Male-Testes
Female-Ovaries
Other Organs
Kidneys
Secrete hormone that regulates
production of red blood cells
Heart
Produces two hormones that help
regulate blood pressure
Feedback Mechanisms
Used to maintain homeostasis
Negative Feedback
Final effect of the response is to turn
off the response
Positive Feedback
Increases response due to extreme
circumstances
Hormone Balance Action
One hormone is balanced by the
action of another
Hormone imbalance can cause
serious disease
Diabetes
Hypothyroidism
hyperthyroidism