Cardiovascular system

Question 1

Vena cava

Question 2

Septum

Question 3

Arteries

Question 4

Veins

Question 5

Capillaries

Question 6

Arterioles and venules

Question 7

Red blood cells

Answer 7

carries oxygen
Binds with protein called haemoglobin
Transported to working muscles
Large surface area - dome shape

Question 8

White blood cells

Answer 8

Help protect the body from fighting infections
Destroy and remove pathogens
Originate in bone marrow and stored in blood

Question 9

Plasma

Answer 9

liquid part of the blood
transports the blood cells, platelets and nutrients to different parts of the body
is 90% water

Question 10

Platelets

Answer 10

help prevent bleeding by clotting and forming a plug
allow performers such as boxers to stop bleeding if they get a cut, allowing them to continue

Question 18

SA node

Answer 18

Often called the hearts pacemaker. Sends an impulse to the right atrium causing the muscular walls to contract. The contraction forces blood from the atrium down into the ventricles.

Question 19

AV node

Answer 19

Located between the atria and the ventricles. Acts as a buffer that slows down the signal from the SAN/slows down the impulse of blood. Otherwise the atria and ventricles would contract at the same time. This allows the ventricles to fill with blood before contraction.

Question 20

Bundle of his & purkinje fibres

Answer 20

Specialised muscle cell that transports the impulses from the AVN. Found in the walls of the ventricles. Travels down the bundle of his to the purkinje fibres. Allow ventricles to contract causing the blood to the pushed out of the heart.