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Transcript
- Cardiac
- Voluntary
- Involuntary
Muscle Types
Muscle Types
Muscle Types
- Each of your muscles is made of many cells or muscle fibres
- They are either
- cardiac
- involuntary
- voluntary
Cardiac muscle
Cardiac Muscle
- Found only in the heart
- We cannot control when it contracts or relaxes
- It contracts and relaxes throughout continuosly thoughout our lives
- It provides the pumping action that circulates blood around the body
- It responds to internal elctrical impulses and contracts, causing the heart to beat
- This drives blood around the body delivering O2 and removing waste products
Involuntary Muscle
Involuntary Muscle
- Found through the middle layer of blood vessels & digestive system
- Also known as smooth muscle
- Operates without our control
- It has many roles including:
- digesting food & expelling waste from the body
- Crucial in sport as it controls a process known as vascular shunting (the redistribution of blood)
- It controls the inner diameter (lumen) of blood vessels
- Through vasodilation (widening of the lumen) and vasoconstriction (narrowing of the lumen) of certain arteries, blood flow to active areas of the body increass while blood flow to inactive areas decreases
- Blood is directed to where it is most needed - the voluntary muscles used for movement
Voluntary Muscle
Volunatary Muscle
- Attached to your bones via tendons
- e.g. biceps and triceps
- They are under conscious control;
- you decide when and how powerfully you can contract them
- They are curcial for to creating movement
- e.g. walking, running, throwing or kicking
- Even when sitting, many voluntary muscles are contracting to maintain your posture
- Therefore, they are crucial in all sporting and physicial activity movements
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