scince study guide

Front

Single-celled organisms such as bacteria perform every function needed for life in their one cell. Bacteria have no tissues, organs, or systems. Why do animals such as humans need levels of organization?

Back

They need it for maintaining a stable internal environment and for ensuring the proper functioning of the body's systems like digesting their food.

Front

Why is the human heart system called a double-loop system?

Back

Because it has two loops one to the body and one to the lungs

Front

Your heart is a powerful, fist-shaped muscle that beats 100,000 times daily to power the circulatory system. What are the functions of the circulatory system?

Back

To carry oxygen and nutrients around in the body to keep healthy and fights diseases

Front

What does the endocrine system help maintain?

Back

It helps maintain homeostasis

Front

How can problems in the lungs cause problems all over the body?

Back

If you were not breathing properly your whole body could shut down and cellular respiration could not happen

Front

Which body organization do lungs represent?

Back

respiratory system

Front

What is the purpose of the digestive system?

Back

  To break down food absorb nutrients and remove food waste

Front

stomach
saliva

small intestine

chewing

Peristalsis

Back

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Front

Know the purpose of the circulatory and respiratory systems

Back

supports the respiratory system by bringing blood to and from the lungs. The circulatory system helps deliver nutrients and oxygen from the lungs to tissues and organs throughout the body and the respiratory system brings in the oxygen needed by the cells.