� Glue the handouts on the following pages:

� 32—page 1 (body systems)

� 33—page 2 (organs)

� 34—page 3 (food enters)

� 35—page 4 (spinal cord)

Body Systems

How do you work?

Circulatory System

� Fast Facts:

� The heart beats

about 3 billion times in the average

person’s life.

� It takes about 20 seconds for a red

blood cell to circle the body.

� One drop of blood contains about 5

million red blood

cells.

Heart

� Fast Facts:

� Women’s hearts beat

faster than men’s.

� The heart weighs less

than a pound.

� In a lifetime the human

heart pumps about 1

million barrels of blood.

Respiratory System

� Fast Facts:

� We breathe about 6

liters of air a minute.

� People under the age of

30 take in twice as

much oxygen as an 80 year old.

Lungs

� Fast Facts:

� You have 1500 miles of

airways in your lungs.

� The right lung is larger

than the left lung in

order to accommodate the heart.

Skeletal System

� Fast Facts:

� At birth humans have

over 300 bones. As we grow they fuse together

so and adult only has

206.

� The human skull is

made up of 29 different bones.

Vertebral Column (Spinal Column)

� Fast Facts:

� Breaking your vertebral

column can damage your spinal cord and

cause paralysis or

death.

� You have 33 vertebrae

separated by spongy disks although some of

them fuse by adulthood.

Muscular System

� Fast Facts:

� Proportionally, your

strongest muscles are in your mouth.

� Muscles account for

about 40% of your body weight.

� The hardest working muscles in your body

are the muscles in the eye.

Smooth Muscles

� Fast Facts:

� Also called involuntary

muscles

� Constricts slowly and

automatically

� It is most of the

muscular structure of

internal organs.

Digestive System

� Fast Facts:

� Your stomach produces

a new mucous lining every two weeks,

otherwise your stomach

would digest itself.

� On average it takes 8

seconds to travel down the esophagus, 3-5

hours in the small intestine, and 3-4 days

in the large intestine.

Liver

� Fast Facts:

� The liver is the only

human organ able to regenerate itself

completely even after

part of it is removed.

� Liver cells take several

years to replace themselves.

� The liver performs 500 different functions.

Excretory System

� Fast Facts:

� Most humans could

survive with only 1/3 of a kidney.

� The excretory system

has many blood vessels to keep the blood

supply high.

Kidney

� Fast Facts:

� The kidney can stretch

to hold 400 mL or urine.

� All of your blood pass

through your kidneys

400 times a day.

� The left kidney is

always higher than the right kidney.

Nervous System

� Fast Facts:

� If you lined up all the

neurons in the human body it would be 600

miles long.

� Nerve cells look like goldfish or a tree.

Brain

� Fast Facts:

� Some doctors compare

the texture of the human brain to tofu.

� The left side of your

brain controls the right side of your body and

the right side of your brain controls the left

side of your body.

Endocrine System

� Fast Facts:

� The human body

contains 30 different hormones to regulate

your body.

� The endocrine system helps control your

growth.

Adrenal Glands

� Fast Facts:

� Your adrenal glands

shrink as you get older.

� Adrenal glands are on

top of the kidney.

� They produce

adrenaline which is

released when your are frightened or excited.

Lymphatic System

� Fast Facts:

� If an infection is present

in the body, the lymph nodes nearest the site

of infection may

become swollen or painful. This is caused

by an accumulation of cells and fluids involved

in the immune

response.

Tonsils

� Fast Facts:

� Tonsils reach their

largest size by sexual maturity but begin to get

smaller after that.

� Human tonsils are bouncy for the first thirty

minutes after they are removed.

Integumentary System

� Fast Facts:

� On average, the human

scalp has 100,000 hairs.

� Fingernails grow faster

than toenails.

� People tend to lose

around 80 hairs a day.

Skin

� Fast Facts:

� In one square inch of

skin, there are 3 million cells.

� In one square inch of

skin, there are 4 yards of nerve fibers.

� There are 100 receptors in each of our fingertips.

� For reproductive system fast facts, you will

have to take health! ☺