5B+4

HUMAN BODAY  ﻿1.Did you know 10 to 10 billion nerves are in your body. 2.Did you know that your small intestine has villi. 3.Did you know liver take away toxins direct to your nutrients. Humans lungs are located in two cavities on either side of the heart but they are not identical. Both are separated into lobes. Muscle cells contain the contractile filaments that move past each other and they change the size of the cell. There are classifiled as skeletal, cardiac, or smooth muscles. Muscles can use either locomotion of the organism itself or movement of internal organs.Examples are they contraction of the heart and peristalsis which pushes food through the digestive system. Examples are the movements of the eye, or gross movements like quadriceps muscle of the the thigh. They are 2 bord types of voluntary muscle fiber: slow twitch and fast twich. Slow twitch fibers contract for long periods of the time but with little force while fast twich fibres contract quikly and  powerfully but fatigue very rapidly. Mostly all they muscles derive from paraxial mesoderm. THIS WHY YOU SHOULDN'T SMOKE BECAUSE THEN YOUR LUNGS WILL BE BLACK. IF YOU WANT YOUR LUNGS BLACK SMOKE BUT IF YOU DONT WANT YOUR LUNGS BLACK DONT SMOKE.