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What are the functions of the heart jQuery112406503247876928144_1679029335032
- - it transports gasses to the respiratory system, nutrients to digestive system and waste materials to the excretory system.
- - Regulates internal blood temperature snd transports hormones throughout the body.
- - Protects against blood loss and toxic substances introduced into the body.
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What are the three main types of blood vessels ??
- - Arteries.
- - veins
- Capillaries
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Arteries description and their function
- - carry oxygen rich blood away from the heart.
- - Contains 30% of your blood
- - They have thick and highly elastic walls with small inside circumference to increase the pressure and maintain blood flow.
- - arteries expand as blood flows through it during the contraction of ventricles and then snaps back during relaxation of ventricles( pulse) ( also known as the snapping motion )
- - contains the outer layer which has collagen, middle layer which is smooth muscle and inner layer containing endothelium cells.
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Veins and the function
- - Have thin and non elastic walls with a large inner circumference.
- - Contraction od surrounding muscles keeps the blood flowing towards the heart.
- - the vein itself is not able to contract.
- - They have one way vales that present blood from flowing backwards.
- - 65% of your blood.
- Always needs to be moving to avoid blood close
- - carries oxygen poor blood towars the heart
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Capillaries and function
- - These are the smallest blood vessel.
- - The capillary wall is just a single layer of cells ( endothelial) ( through diffusion)
- - diameter is large enought to allow red blood cells through
- - Blood flowing through the capillaries is the slowest to provide time for diffusion to and from cells regarding the absorption, transport and release of nutrients, gas or waste.
- - They separate veins and arteries.
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Vasodilation
- - this is the increasing of blood flow near the skin to release heat ( flushed face )
- - this is when capillaries dilate or are wider to allow more nutrients to move through you body to help different systems such as digestive
- - this is the dilation of blood vessels
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Vasoconstriction
- - this is the decreasing of blood flow near the skin to help conserve heat ( numb fingers )
- Also known as thermogulation: heat and balance.
- Blood vessel constriction( smaller )
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What controls the dilation and constriction of blood vessels ?
- - the nervous system controls both constriction and dilation to either decrease or increase blood flow to specific body parts
- Vasoconstriction and vasodilation.
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