Animal Systems WS 25-26

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1. Bones, tendons, and ligaments make up the system.

• Skeletal system
• Heart

2. Muscles are attached to bones by

• tendons
• ligamnets
• string

3. When a muscle receives a nerve signal, it ____________ and pulls on a tendon.

• contracts
• splits
• runs
• drags

4. From the mouth, food travels down the muscular ________to the stomach.

• intestine
• esophagus

5. Food is churned with strong acids in the

• stomach
• arms
• legs

6. The system that removes wastes such as water, salt, carbon dioxide, and nitrogen from the body is called the .

• digestive system
• excretory system
• nervous system

7. The blood carries wastes to the ___________ , which filter the wastes from the blood.

• heart
• lungs
• kidneys

8. The ____________ and the passageways that lead to them make up the respiratory system in mammals.

• heart
• lungs
• gallbladder

9. The heart pumps oxygen-poor blood to the alveoli, where the oxygen enters the blood and __________ leaves the blood.

• oxygen
• carbon
• carbon dioxide