The Muscular System

By: Reese Kimberly Nicole Jessica
• One big function of the Muscular System is movement. Skeletal muscles are
arranged in pairs on opposite sides of joints. As one muscle contracts, the
opposing muscle must relax to cause movement. This movement is commonly
referred to as locomotion.
• Generating heat is another function. The muscular system responds to a
reduction in core body temperature by shivering. Shivering is an involuntary
response in which muscles contract rapidly to generate heat. The colder you
are, the more you shiver. Shivering muscles demand an increase in
oxygenated blood, which is drawn from nonessential organs to increase your
body temperature.
• The muscular system also maintains posture. Such as keeping your head up,
pulling your shoulders back and supporting your spine. Muscles involved in
posture generate low amounts of force for long periods and are often
referred to as tonic muscles. Tonic muscles do not generate much movement
but instead hold your limbs in position by generating isometric contractions.
• There are 3 types of muscle tissue in your body.
• The first, Cardiac muscle is found in the heart and nowhere else. It can
contract time after time without getting tired. Cardiac muscle is involuntary
• Smooth muscle is found in organs of the digestive system and blood vessels. It
‘s lining in the stomach causes it to twist and turn to mix food with digestive
juices. Smooth muscle is also involuntary.
• Skeletal muscle is voluntary. You can control these types of muscles. Only
skeletal muscles are responsible for making the body move. These muscles
attach to your bones to cause movement.
• The muscular system works with the Circulatory system. Without the
muscular system the heart would not be able to pump blood.
• The muscular system interacts with the digestive system in several
places. The muscles of the jaw mash food, and then muscles along the
esophagus move food from the mouth to the stomach. Muscles along
the intestines move digesting food along.
• The main interaction between the muscular system and the respiratory
system is the diaphragm: a large, flat muscle that separates the lungs
from the intestines. It is the movement of the diaphragm that causes
the lungs to inflate and deflate.
• There are muscles in the roots of your hair that give you goose
• It takes 17 muscles to smile and 42 to frown.
• The hardest working muscle is in the eye
• Muscles can account for 40% of the body's weight.
• The smallest muscles are in the middle of the ear.
• Books:
The human body – Christina Coster-Longman
The visual dictionary of the human body- Mary Lindsay