The Muscular System 5/24/12 pgs. 155-156

Know Evidence: you create The Muscular System What types of muscles are there? (There are three of them.) “I don’t know any.” is not an acceptable answer. Use complete sentences. Evidence: you create

The Muscular System Information Muscle action 1. Voluntary Clarifying ?s Muscle action 1. Voluntary 2. Involuntary involuntary muscles muscles that we cannot consciously control They move on their own. Example: heartbeat, food digestion, breathing - muscles that we can consciously control voluntary muscles Example: smiling, chewing, walking, running Muscle types - muscles attached to your bones – provide forces to move your joints – voluntary muscles – fast reacting (AKA striated or banded muscles) 1. skeletal muscles Example: quadraceps, deltoid - Control movements inside your body – involuntary muscles – react slowly (non-striated) 2. smooth muscles Example: digestive muscles, breathing diaphragm

The Muscular System Information Ex: the heart Clarifying ?s - forms walls of your heart – doesn’t tire out 3. cardiac Ex: the heart tendons - Strong connective tissue that attaches muscles to bone Example: Achilles’ tendon How skeletal muscles work Muscles work in pairs. One is the flexor; the other is the extensor. Ex. Bicep/tricep

The Muscular System Information Example: Biceps/triceps Clarifying ?s Step 1: brain sends message along the nerve fibers telling the muscle to contract. Step 2: muscle contracts. Step 3: muscle relaxes. Step 4: opposing muscle receives msg to contract & pulls relaxed muscle back to normal size. Example: Biceps/triceps Muscle care Exercise – makes muscles grow wider and thicker – makes you stronger Stretching – makes muscles more flexible Summary:

The Muscular System Information Muscle action 1. Voluntary Clarifying ?s Muscle action 1. Voluntary 2. Involuntary involuntary muscles muscles that we cannot consciously control They move on their own. Example: heartbeat, food digestion, breathing - muscles that we can consciously control voluntary muscles Example: smiling, chewing, walking, running Muscle types - muscles that are attached to your bones – provide forces to move your joints – voluntary muscles – fast reacting (also called striated or banded muscles) 1. skeletal muscles Example: quadraceps, deltoid, abdominus rectus - Control movements inside your body – involuntary muscles – react slowly (non-striated) 2. smooth muscles Example: digestive muscles, breathing diaphragm - The muscle that forms the walls of your heart – does not tire out like skeletal muscles ((striated) 2. cardiac muscle Example: the heart tendons - Strong connective tissue that attaches muscles to bone Example: Achilles’ tendon

The Muscular System Information Clarifying ?s How skeletal muscles work Muscles can only cause movement by contracting or getting shorter and fatter. 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. 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. Example: Biceps in upper arm bends elbow joint; triceps on back of arm straightens elbow joint. Muscle care Exercise – makes muscles grow wider and thicker – makes you stronger Stretching – makes muscles more flexible Summary:

This PowerPoint was created from Charlene Shea’s lecture notes by Tim Paterek. It is copyrighted and may not be reproduced outside the Vancouver School District. All pictures came from Google Image Search. To fall within the Fair Use Guidelines, this PowerPoint must be used within the confines of the classroom and may not be published back onto the Internet unless the pictures are removed.