Download Muscular System.pptx

The Muscular
System
Types of Muscles
Involuntary Muscles - not under your conscious control
ex: digesting food
Voluntary Muscles - under your conscious control
ex: smiling, shooting a basketball, walking
3 Types of Muscle Tissue:
1. Skeletal muscle
2. Smooth muscle
3. Cardiac muscle
Skeletal Muscle
- Attached to the bones of your skeleton by tendons
- Skeletal muscles provide the force that moves your
bones
- Also known as striated muscle, because skeletal
muscle cells appear banded or striated
- Voluntary movements!
- Can react very quickly, but also tire quickly
Skeletal Muscles and
Tendons
Tendons - strong connective tissue that attaches muscle to
bone
Smooth Muscle
- Inside many internal organs
- Involuntary movements!
- Work automatically to control certain movements inside your body
ex: digestion
- Not striated
- React more slowly, and tire more slowly
Cardiac Muscle
- Found only in your heart
- Involuntary movements!
- Striated
- NEVER tires, can contract repeatedly...heartbeats
Muscles at Work
- Muscles contract by receiving messages from the
nervous system
- Muscles can only contract and relax, they cannot
extend, so they work in pairs to move in two directions
- While one muscle contracts, the other relaxes
Muscles at Work:
Skeletal Muscles, Voluntary
Tendons attach muscle to bone on the periosteum
Tricep contracts
when straightening
arm
Bicep contracts when
raising lower arm
Relaxed
The elbow joint is a hinge joint, it makes
motions that are back and forth.
Cartilage covers
the ends of bones to keep
them from rubbing against
each other
Ligaments hold elbow
joint together
Muscular Strength and
Flexibility
EXERCISE!
-makes muscles grow in size
- "Warming up" before a workout helps to increase flexibility
and blood flow to muscles
-When you lift weights, it increases protein production in
muscle cells, which makes muscles bigger
- Can become injured...can over stretch or overwork muscles,
tear tendons, get muscle cramps