Content Outline for Teaching - Potosi School District - Home

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Content Outline
for Teaching
The Human Body (continued)
2. The circulatory system is made up of the heart,blood vessels, and blood. The
heart pumps blood to all the cells of the body.
a. Red blood cells carry oxygen.White blood cells fight infections and heal
wounds.
b. The four major blood types are A, B, AB, and O.
D. The lymphatic system collects tissue fluid and returns it to the blood.
E. The body has many ways to defend itself against disease-causing organisms.
1. The skin and respiratory, digestive, and circulatory systems block or destroy
many disease-causing organisms.
2. In specific immunity, the body makes antibodies that destroy disease-causing
organisms.
F. The nervous and endocrine systems control the body.
1. The brain, spinal cord, nerves, and nerve receptors make up the nervous system.
a. The nervous system sends messages to and from the brain to all parts of the
body.
b. A reflex is an involuntary, automatic response to a stimulus. Reflexes help
protect your body by allowing your body to respond without you having to
think about what to do.
2. In the endocrine system, chemicals called hormones carry messages throughout
the body.
Discussion Question
What are some examples of body systems working together to perform particular functions?
Possible answers: The skeletal and muscular systems work together to allow movement.
The digestive and excretory systems work together to process food. The respiratory and circulatory
systems work together to deliver oxygen to body cells. Other examples are possible.
The Human Body 64