The Muscular System

Gaiser Life Science

KnowWhat types of muscles are there? (There are three of them.)

Evidence

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The Muscular System

“I don’t know any.” is not an acceptable answer.Use complete sentences.

After listening to the PowerPoint lecture, come back here and list evidence to explain why your answer to the above question is or is not a good answer. You may also use other outside sources to help you respond.

Clarifying ?s Information

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Muscle action-muscles that we cannot consciously controlThey move on their own.

- muscles that we can consciously control

1. Voluntary 2. Involuntary

- muscles that are attached to your bones – provide forces to move your joints – voluntary muscles – fast reacting (also called striated or banded muscles)

- Control movements inside your body – involuntary muscles – react slowly (non-striated)

Example: digestive muscles, breathing diaphragm

Muscle types

Example: heartbeat, food digestion, breathing

Example: smiling, chewing, walking, running

The Muscular System

Example: quadraceps, deltoid, abdominus rectus

involuntary muscles

voluntary muscles

1. skeletal muscles

2. smooth muscles

Clarifying ?s Information

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The Muscular System

Example: Achilles’ tendon- Strong connective tissue that attaches muscles to bone

Muscles work in pairs. One is the flexor; the other is the extensor.One of the pair must be in relaxation state when the other contracts or you get a Charlie horse or cramp.

How skeletal muscles work

Muscles can only cause movement by contracting or getting shorter and fatter.

- The muscle that forms the walls of your heart – does not tire out like skeletal muscles ((striated)

Example: the heart

3. cardiac muscle

tendons

Clarifying ?s Information

Page 60Summary:

The Muscular System

Example: Biceps in upper arm bends elbow joint; triceps on back of arm straightens elbow joint.

Step 1: A message is sent from the brain along the nerve fibers instructing the muscle to contract.Step 2: The muscle contracts. Step 3: The muscle relaxes.Step 4: The opposing muscle recieves the command to contract & pulls the relaxed muscle back to normal size.

Muscle care Exercise – makes muscles grow wider and thicker – makes you strongerStretching – makes muscles more flexible

Clarifying ?s InformationThe Muscular System

Muscle action-muscles that we cannot consciously controlThey move on their own.

- muscles that we can consciously control

1. Voluntary 2. Involuntary

- muscles that are attached to your bones – provide forces to move your joints – voluntary muscles – fast reacting (also called striated or banded muscles)

- Control movements inside your body – involuntary muscles – react slowly (non-striated)

Example: digestive muscles, breathing diaphragm

Muscle types

Example: heartbeat, food digestion, breathing

Example: smiling, chewing, walking, running

Example: quadraceps, deltoid, abdominus rectus

involuntary muscles

voluntary muscles

1. skeletal muscles

2. smooth muscles

Example: Achilles’ tendon- Strong connective tissue that attaches muscles to bone

- The muscle that forms the walls of your heart – does not tire out like skeletal muscles ((striated)

Example: the heart

2. cardiac muscle

tendons

Clarifying ?s Information

Summary:

The Muscular System

Muscles work in pairs. One is the flexor; the other is the extensor.One of the pair must be in relaxation state when the other contracts or you get a Charlie horse or cramp.

How skeletal muscles work

Muscles can only cause movement by contracting or getting shorter and fatter.

Example: Biceps in upper arm bends elbow joint; triceps on back of arm straightens elbow joint.

Step 1: A message is sent from the brain along the nerve fibers instructing the muscle to contract.Step 2: The muscle contracts. Step 3: The muscle relaxes.Step 4: The opposing muscle recieves the command to contract & pulls the relaxed muscle back to normal size.

Muscle care Exercise – makes muscles grow wider and thicker – makes you strongerStretching – makes muscles more flexible

This PowerPoint was created from Charlene Shea’s lecture notes by Tim This PowerPoint was created from Charlene Shea’s lecture notes by Tim Paterek. It is copyrighted and may not be reproduced outside the Paterek. It is copyrighted and may not be reproduced outside the

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