Download lesson-2-the-heart

Lesson Starter
•List the organelles found in an animal
cell
•Give 3 examples of a specialised cell
•What is the job of blood?
•What types of cells are found in blood?
Learning Intention
•To be able to identify the parts of the
circulatory system
•To be able to identify and explain the
functions of different blood vessels
Cell Organisation
• Digestive
• Circulatory
• Respiratory
• Reproductive
• Nervous
Cell Organisation (copy)
• A TISSUE is a group of SPECIALISED CELLS working together
to perform a particular function. ORGANS are composed of
several tissues working together on one particular function;
Organs work together in a SYSTEM.
• Examples of systems include the digestive, circulatory,
respiratory, nervous and reproductive system.
The Circulatory System
• Oxygen, Carbon Dioxide
• Dissolved food
• Circulatory System carries around body to where needed
The Circulatory System
• Heart- Pump
• Blood Vessels (Veins,
arteries, capillaries)Tubes
• Blood carried to every
part of body
The Circulatory System (copy)
• The circulatory system is composed of the heart,
blood and blood vessels.
• Its job is to transport essential substances like
oxygen, glucose around the body.
The Heart
•Muscular
•Blood, Nerve, Muscle
tissue
•Pumps blood around
body
The Heart
• https://www.twig-world.com/film/heart976/
Questions..
1) How big is the heart (roughly)?
2) Roughly how many times does the heart
beat each day?
3) How many chambers does the heart have?
4) Why is one side of the heart shown to be
blue and one shown to be red?
5) Why is one side of the heart thicker than
the other?
6) What causes the sound of the heart beat?
The Heart
Questions..
1. How big is the heart (roughly)? – Roughly the size of your fist
2. Roughly how many times does the heart beat each day? – 100,000 times
3. How many chambers does the heart have?- 4 (2 atrium, 2 ventricles)
4. Why is one side of the heart shown to be blue and one shown to be red? –
one side has oxygenated blood, one side deoxygenated
5. Why is one side of the heart thicker than the other?one side pumps blood to your full body
6. What causes the sound of the heart beat? –
the opening and closing of valves
The heart
• Flipped
• 4 Chambers
• Atrium collect
blood
• Ventricles contract
and pump blood
• Cardiac muscle
Right
Atrium
Right
Ventricle
Left
Atrium
Left
Ventricle
The Heart (copy)
• The upper chambers are the right
and left atria these collect blood.
• The lower chambers are the right
and left ventricles, these pump
blood.
• The wall of the heart is made of
cardiac muscle.
• Vena Cavadeoxygenated blood to
the heart
• Pulmonary Arterycarries blood from right
ventricle to lungs
• Aorta- the main artery
of the body, supplying
oxygenated blood to
the circulatory system
• Pulmonary Veinreceive oxygenated
blood from the lungs
The Heart
Aorta
Pulmonary Artery
Pulmonary
Vein
Vena Cava
The Heart
Valves prevent
the backflow of
blood to ensure
blood keeps
circulating
Valve
Valve
Circulation of blood through the heart
Blood high in oxygen is called oxygenated blood
Oxygenated blood returns from the lungs…
•in the pulmonary vein
•enters the left atrium
•into the left ventricle
•out through the aorta
•to the body
Blood low in oxygen is called deoxygenated blood.
Deoxygenated blood returns from the body tissues…
•in the vena cava
enters the right atrium
•into the right ventricle
out through the pulmonary artery
•to the lungs where it picks up oxygen
Choose a picture and explain how it relates to what
you have learnt today