Why do humans sweat?
Sweat is your body's natural way of cooling down. When you get really hot from the bright sun or from running around outside, the tiny pores on your body open up to let heat out – and this is when you sweat! And, as the sweat comes out of your body, you cool off!
Why is water good for you?
People, animals and plants all need clean water to live. Infact more plants and animals live in water than on land. Blood is mostly water, and your muscles, lungs, and brain all contain a lot of water. Your body needs water to regulate body temperature and to provide the means for nutrients to travel to all your organs. Water also transports oxygen to your cells, removes waste, and protects your joints and organs.
Why is blood red?
Red blood cells are red only because they contain a protein chemical called hemoglobin which is bright red in color. Hemoglobin contains the element Iron, making it excellent for transporting oxygen and carbon dioxide.
Human Body
The human body is made up of a head, neck, torso, two arms and two legs. The average height of an adult human is about 5 to 6 feet tall. The human body is made to stand erect, walk on two feet, use the arms to carry and lift, and has opposoble thumbs (able to grasp).
The adult body is made up of:
- 100 trillion cells
- 206 bones
- 600 muscles
- 22 internal organs
There are many systems in the human body:
- Circulatory System (heart, blood, vessels)
- Respiratory System (nose, trachea, lungs)
- Immune System (many types of protein, cells, organs, tissues)
- Skeleton System (bones)
- Excretory System (lungs, large intestine, kidneys)
- Urinary System (bladder, kidneys)
- Muscular System (muscles)
- Endocrine System (glands)
- Digestive System (mouth, esophogus, stomach, intestines)
- Nervous System (the brain, spinal cord, nerves)
- Reproductive System (male and female reproductive organs)