Blood

Oxygen

Air

Carbon Dioxide

1. A whole grape enters your mouth and your teeth break it into smaller pieces that are easier to swallow.

1. The bagel you ate this morning finally leaves your body as a waste material called feces.

1. Your body uses the eggs you had for breakfast to gain energy, grow, and heal.

1. Small pieces of chewed hamburger are broken down into smaller molecules by enzymes.

1. Messages travel to and from the brain to other parts of the body through the spinal cord.

1. The spinal cord controls body movement and the brain controls coordination.

The spinal cord sends messages to the brain, telling it what functions to perform.

1. The spinal cord is a bone in the back that supports your skull, which houses the brain.

your stomach growling

1. snapping your fingers

moving your leg

moving your arm

1. The endocrine system directly produces sperm cells in men and ovarian cells in women, both necessary for puberty.

1. The reproductive system produces hormones that are necessary for the endocrine system to function properly.

The endocrine system produces hormones that make puberty possible.

1. The endocrine system regulates mood and metabolism, both necessary for reproduction.

It eliminates body waste

It excretes liquid waste dioxide

1. It excretes sweat through the skin

It involves the kidneys

Your skin fought off pathogens that tried to enter your body.

Your body is fighting against germs it considers invaders.

Your lymph level is low and that's why the body is working hard.

1. Your body is not producing enough lymphocytes

the process by which nutrients are absorbed in the villi of the small intestine

the tendency of the body to maintain internal balance despite changes in external conditions

the exchange of oxygen and carbon dioxide in the lungs

the filtration of blood in the kidneys that produces urine

blood, lungs, lymph nodes

kidneys, blood vessels, esophagus

Blood, blood vessels, heart

Skin, heart, bones