1. Circulatory System

2. STARTER

3. AIM ALL- understand the functions of the circulatory system
MOST- explain the structure and function of blood vessels
SOME-apply knowledge to exam questions without notes

4. The Circulatory System
The circulatory system is made up of 3 main components:
The Heart
The Blood
The Blood Vessels

5. Functions of the CS 1 Transport 2. Body temperature control
3. Protection

6. Functions of the circulatory system
The circulatory system has three functions:
1. Transporting substances around the body. These include oxygen, glucose, carbon dioxide, nutrients, water and waste products.
2. Controlling body temperature.
3. Protecting the body. Blood contains cells and anti-bodies that fight infection and clotting agents to stop bleeding.
The circulatory system is described as a double system because it has two loops.

7. The circulatory system-flow of blood
Deoxygenated blood is pumped from the heart to the lungs through the pulmonary artery.
Oxygenated blood returns to the heart through the pulmonary vein.
lungs
Oxygenated blood is pumped at high pressure from the heart to the body through the aorta.
Deoxygenated blood returns to the heart through the vena cava.
body’s
cells

8. Flow of Blood Left atrium Left Ventricle Aorta Body Vena Cava
Right Atrium
Right Ventricle
Pulmonary Artery
Lungs
Pulmonary Vein

9. Double Pump
The right hand side of the heart carries deoxygenated blood from the body to the heart and back to the lungs
The left hand side of the heart carries oxygenated blood from the lungs past the heart and to the body

10. Blood Vessels Blood vessels allow blood to flow around the body
There are three types-
Arteries
Veins
Capillaries

11. Blood vessels thick outer wall
thick inner layer of muscle and elastic fibres
narrow central tube (lumen)
ARTERY
thin outer wall
thin inner layer of muscle and elastic fibres
wide central tube (lumen)
CAPILLARY
VEIN
wall only one cell thick

12. Arteries Take oxygenated blood AWAY from the heart Thick walls
High pressure
No valves

13. VEINS Take deoxygenated blood TO heart (TV) Thin walls Low pressure
They have valves

14. Capillaries Very thin Connects arteries to veins
Allow oxygen and carbon dioxide to pass through their walls

16. STARTER Quadriceps Bicep Femur Tibia Fibula Humerus Ulna Pectorals
Ball and Socket
Radius
Rotation

17. EXAM Questions
Describe the role of blood in transport in the circulatory system (2)
Describe the role of blood in controlling body temperature (2)
Describe the role of protection in the circulatory system. (2)
Describe the structure and function of arteries (2)
Describe the structure and function of veins (2)

18. PULSE Draw a human body/stick person
Label the places where it is possible to take your pulse
Temporal
Femoral
Radial
Carotid

19. Blood Pressure Amount of force on the walls of the blood vessels
Blood Pressure monitor

20. How to reduce blood pressure?A D

21. Effects of Exercise- Short term
Increase in heart rate
Increase in body temperature
Blood vessels dilate (get wider)

22. Effects of exercise- long term
Increase in size and strength of heart
Decrease in resting heart rate
Decrease in blood pressure

23. Exam Questions 4. Name 2 places where your pulse can be taken from (4)
5. What is blood pressure (1)
6. Name 3 ways a person with high blood pressure can try to reduce it (3)