Download Human Body system science notes

Human Body
Nervous System: carries messages and pain
Synapse: what holds the nerves together
CNS: central nervous system, it consists of the brain and spinal cord
PNS: peripheral nervous system, it consists of everything else
(synapse)
Wherever a break is on a spine, the nerves only travel up to that point and they have
no control of anywhere lower.
Muscular System: movement, helps to manipulate the skeletal system
 There are three types of muscle categories: skeletal, smooth, and cardiac.
 Skeletal muscles are voluntary, and cardiac and smooth muscles are
involuntary
 Smooth muscle lines the digestive tract, skeletal muscles are muscles around
your body that you can control and exercise
 Peristalsis is a muscle involuntary action- contracts small intestine, and the
cardiac muscles are in your heart.
 There are over 600 muscles in the body
Skeletal System: supports, protects, and provides protection -> Bones -> RBC (Red
Blood Cells) , stores fat (there are 206 bones in the body
The femur bone is the largest and longest and strongest bone in the body.
Circulatory System: circulation of blood (veins, capillaries and arteries)
 There are 44 blood types: A, B, AB, O
Respiratory System: oxygenating blood, breathing
 The wind pipe breaks into 2 pipes: bronchioles. At the end of the pipe, there
are alveoli which are little sacs at the bottom
Excretory System: removes waste and provides body with homeostasis (sweat and
release of salt)
Reproductive System: to produce offspring
Endocrine System: glands, hormones (EX: thyroid gland, pituitary gland)
Integumentary System: skin, protects body from damage