ORGANISATION - The Heart and Blood Vessels

Question 1

Heart

Answer 1

Pumps blood around the body in a double circulatory system

Question 2

Left Right Atria

Answer 2

Receive blood from veins

Question 3

Left Right Ventricles

Answer 3

Pump the blood out into arteries

Question 4

How does Blood Move?

Answer 4

Blood enters heart through atria. Atria contracts and force blood into ventricles. Ventricles contract and force blood out of heart. Valves make sure blood flows in correct direction.

Question 5

Pacemaker

Answer 5

Electrical devices used to correct irregularities in the heart rate. Natural resting heart rate is controlled by group of cells located in the right atrium that act as a pacemaker

Question 6

Gaseous Exchange

Answer 6

Heart sends blood to lungs via pulmonary artery. Air obtained by breathing reaches lungs through trachea. Trachea divides into 2 tubes - bronchi. Bronchi divide to form bronchioles. Bronchioles divide until they end in tiny air sacs called alveoli. Blood is taken back to the heart through the pulmonary vein.

Question 7

Arteries

Answer 7

Take blood from your heart to your organs. Thick walls

Question 8

Veins

Answer 8

Take blood from your organs to your heart. Thinner walls and valves to prevent backflow

Question 9

Capillaries

Answer 9

Allow substances needed by cells to pass out of the blood. Allow substances produced by the cells to pass into the blood. Narrow, thin-walled blood vessels