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The Cardiovascular System

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by

Kelly McGregor

on 23 March 2016

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Transcript of The Cardiovascular System

The Cardiovascular System
It has 3 major components
Blood
Blood Vessels
The Heart
BLOOD VESSELS
Watch the following clip and fill in the information in you work booklet
ARTERIES
always lead away from the heart

carry
oxygenated
blood
(except for the pulmonary artery)

have
strong, elastic
walls to withstand the pressure of the blood

branch into smaller arteries (arterioles) which get smaller and thinner and eventually branch into
capillaries
VEINS
always return blood to the heart

carry
deoxygenated
blood (except the pulmonary vein)

veins have
thinner
walls because the blood pressure in veins is lower

due to the lack of blood pressure muscle contraction assist in moving blood through the veins

have
valves
to stop blood flowing backwards

venules are smaller veins that lead from capillaries into veins
CAPILL
ARIES
are a link between the
arteries
and
veins

capillary networks are particularly dense in active tissue e.g muscles and the brain

Capillary walls are extremely thin which allow the exchange of
oxygen
, nutrients and hormones from the blood to pass easily through into the cells of the body’s tissues

Meanwhile,
carbon dioxide
and cell wastes are received back into the capillaries.
What is Blood?
What do you know about the heart???
While watching the following clips, write down as many words as you can that describe the heart:
1. function
2. structure
Structure of the heart
THE HEART
pump
muscle
blood
contracts
chambers
oxygen
arteries
veins
Blood flow through the Heart
4 chambers
Atrium (top)
Ventricle (bottom)
Ventricles have strong walls. The left ventricle has the strongest walls for a powerful contraction to pump blood around the body.
When labeling a diagram of the heart, your looking at a mirror image!
so the left side of the heart will ALWAYS be on the right side of the page!!!!!
THINK, PAIR, SHARE
Look at your veins, what do you see???
You have 5 mins to discuss with a friend why we use the colours
red
and
blue
when labeling blood on diagrams!


OXYGENATED BLOOD
DEOXYGENATED BLOOD
VALVES in the heart allow blood to flow in only one direction
AORTA
Is the artery leading from the left ventricle, delivering
oxygenated
blood to the body
Is has thick, strong walls and is very elastic

Why does the AORTA have thick, strong, elastic walls?
OXYGENATED BLOOD
Only flows through the LEFT side of the heart
DEOXYGENATED BLOOD
Only flows through the RIGHT side of the heart
SO we have already know that:
Arteries
ALWAYS carry blood away from the heart
Veins
ALWAYS return blood to the heart
Arteries

carry

oxygenated

blood
Veins
carry
deoxygenated
blood
AND
BUT thinking about the structure of the heart is there any exception to this?
PULMONARY ARTERY and PULMONARY VEIN

pulmonary means lungs

The Pulmonary Artery carries blood from the heart to the lungs but it is DEOXYGENATED
The Pulmonary Vein carries blood back to the heart but it is OXYGENATED

This is the only exception to the rule!!!
HEART RATE
Put your hand on your heart:
1. what can you feel?
2. why can you feel it?
• Heart rate is a measure of the number of times the heart beats per minute (left ventricle contraction)

• The harder the heart has to work to pump blood the greater a person’s heart rate will be.

• A healthy and fit person will generally have a lower heart rate than an unhealthy and fit person.

• You can measure you heart rate by measuring your pulse

• This can be done on the wrist or at the neck
BLOOD PRESSURE
Blood pressure is the pressure exerted on the arteries during the cardiac cycle (contracting and relaxing of the heart)
Systole (contracting)
Diastole (relaxing)
120
80
the heart is the only cardiac muscle
a muscular pump that contracts regularly to pump blood around the body
4 chambers - Atrium (Atria) top chambers
- Ventricles bottom chambers
Atrium receives blood from body and lungs
Ventricles pumps blood out of the heart (thicker stronger walls)
heart beats approx 70 beats per minute
a system of one way valves allow blood flow only in one direction on the heart
the heart is covered by vessels called coronary arteries (a blockage in these will cause a heart attack)
Full transcript