Muscular System- ANNE-1

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muscular system

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Muscular System:

Muscular System By: Harvy Silverio , Jhay Albarico Revised by: Ms. Tuscano

The Muscular System:

The Muscular System Defn : made of bundles of muscle fibers which are held together by connective tissue . Fact: You have over 650 major muscles in the body and they work the same way. Over 50 of those muscles are in your face alone. It takes 17 muscles to smile and over 40 to frown. Your most active muscles are those in your eyes. They move more than 100,000 times a day.

While most people associate muscles with strength, they do more than assist in lifting heavy objects. The 650 muscles in the body not only support movement — controlling walking, talking, sitting, standing, eating and other daily functions that we consciously perform — but also help to maintain posture and circulate blood and other substances throughout the body, among other functions .:

While most people associate muscles with strength, they do more than assist in lifting heavy objects. The 650 muscles in the body not only support movement — controlling walking, talking, sitting, standing, eating and other daily functions that we consciously perform — but also help to maintain posture and circulate blood and other substances throughout the body, among other functions .

Three Types of Muscles:

Three Types of Muscles

Types of Muscles 1.) Skeletal Muscle Skeletal muscles are the only voluntary muscle tissue in the human body and control every action that a person consciously performs. Most skeletal muscles are attached to two bones across a joint, so the muscle serves to move parts of those bones closer to each other. :

Types of Muscles 1.) Skeletal Muscle Skeletal muscles are the only voluntary muscle tissue in the human body and control every action that a person consciously performs. Most skeletal muscles are attached to two bones across a joint, so the muscle serves to move parts of those bones closer to each other. Attached to skeleton by tendons Causes movement of bones at the joints. And yes… they do fatigue Muscle fatigue activity  what substance forms causing muscle fatigue

2.) Smooth Muscle:

2.) Smooth Muscle Visceral, or smooth, muscle is found inside of organs such as the stomach, intestines, and blood vessels. It is called a smooth muscle because unlike skeletal muscle, it does not have the banded appearance of skeletal or cardiac muscle. The weakest of all muscle tissues, visceral muscles send signals to contract to move substances through the organ. Because visceral muscle is controlled by the unconscious part of the brain, it is known as involuntary muscle as it cannot be controlled by the conscious mind.

Smooth Muscle:

Smooth Muscle They fatigue… but very slowly Found in the circulatory system Lining of the blood vessels Helps in the circulation of the blood Found in the digestive system Esophagus, stomach, intestine Controls digestion Found in the respiratory system Controls breathing Found in the urinary system Urinary bladder Controls urination

3.) Cardiac Muscle:

3.) Cardiac Muscle Found only in the heart, cardiac muscle is responsible for pumping blood throughout the body. The heart’s natural pacemaker is made of cardiac muscle that signals other cardiac muscles to contract. Like visceral muscles, cardiac muscle tissue is controlled involuntarily. While hormones and signals from the brain adjust the rate of contraction, cardiac muscle stimulates itself to contract.

PowerPoint Presentation:

Involuntary Some involuntary functions of the muscular system are muscles to help you breathe, make your heart beat, and help move food through the digestive system. Voluntary Some voluntary functions of the muscular system are like playing piano, running, playing video games, and throwing a ball. Functions of the Muscular System

Muscle Control:

Muscle Control Voluntary muscles- muscles that you are able to control Examples are leg and arm muscles Involuntary Muscles- you can not move them consciously. They just keep working Examples - heart

Types of Muscle Tissue (cont.):

Types of Muscle Tissue (cont.) Muscle Group Major Location Major Function Mode of Control Skeletal Muscle Attached to bones and skin of the face Produces body movements and facial expressions Voluntary Smooth Muscle Walls of hollow organs, blood vessels, and iris Moves contents through organs; vasoconstriction Involuntary   Cardiac Muscle Wall of the heart Pumps blood through heart Involuntary

MOVEMENT PERFORMED BY MUSCLES:

MOVEMENT PERFORMED BY MUSCLES

PowerPoint Presentation:

1. Adduction ~ moving a body part toward the midline 2. Abduction ~ moving a body part away from the midline

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3.Flexion (Flexor) ~ decreasing the angle between two bones and body part

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4. Extension ( Extensor) ~ increasing the angle between two bones and body part

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5. Rotation ~a circular motion which turns a body part on its axis

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7. Levators : lift a part of the body

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8. Depressors : lower a part of the body

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9. Supination : the act of rotating the arm so the palm of the hand is upward.

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10. Pronation : the act of rotating the arm so the palm of the hand is turned downward.

Attachments and Actions: Body Movements (cont.):

Elevation – lifting a body part; for example, elevating the shoulders as in a shrugging expression Depression – lowering a body part; for example, lowering the shoulders Attachments and Actions: Body Movements (cont.)

There are about 60 muscles in the face.:

There are about 60 muscles in the face. Smiling is easier than frowning . It takes 20 muscles to smile and over 40 to frown. Smile and make someone happy .

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