Homeostasis and Human Body Systems. Imagine you are playing softball on a warm summer day. Write down two ways that your body would adjust to keep you cool and to keep your muscles working. Key Ideas. How does a change in the external environment affect an organism?
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Decrease room temperature
Increase room temperature
Increase room temperature
Write down what you feel when the limb is straightened and what you feel when the limb is bent.
Blood vessels and nerves
Bone is surrounded by a tough layer of connective tissue
Network of tubes that contain blood vessels and nerves.
What do you think might happen to the bones that are not exposed to force, such as the bones of astronauts in zero gravity?
Slightly Movable Joints
Freely Movable Joints
What are the three types of muscle?
What is an impulse?
Key Concept Questions:
What are the different classes of drugs that directly affect the central nervous system?
What is the effect of alcohol on the body?
They might be slow moving and sleepy and speak with a slur
Which type of addiction do you think would be harder to break – psychological or physical?
The endocrine system is made up of glands that release their products into the bloodstream. These products broadcast messages throughout the body.
The chemicals that “broadcast” messages from the endocrine system are called hormones.
hormone carried by blood
Hormones produced by the thyroid gland and the parathyroid glands maintain the level of calcium in the blood
The adrenal glands help the body prepare for and deal with stress
Insulin and glucagon released from the pancreas help to keep the level of glucose in the blood stable
When the pancreas produces too little insulin, a condition known as diabetes mellitus occurs.
Very high blood glucose levels can damage many organs and tissues, including the coronary arteries.
undigested material left in the colon
compounds that the body can use, such
as vitamin K.
remains after the water has been
removed passes through the rectum
and is eliminated from the body.
What are the structures of the respiratory system?
Your heart can beat faster or more slowly, depending on your body’s need for oxygen-rich blood.
In times of stress, does the heart beat faster or slower?
It beats faster
Answer the following question:
How does the human body act like a thermostat?