Soc 16

Question 1

Veins

Answer 1

• Veins carry blood into the heart
• Veinshave much thinner walls, are less elastic and carry blood at a lower pressure
• Veins contain many valves which helps deoxygenated blood flow to the
heart

Question 2

Capillaries

Answer 2

Capillaries are microscopic vessels - just one cell thick
• Atone end, capilaries cary oxygenated blood which transfers oxygen and
nutrients to the muscles
• Althe otherend, they cary deoxygenated blood into the veins, picking up waste products and taking them around the body to dispose of them
• Capillaries are where gaseous exchange takes place

Question 3

Arteries

Answer 3

Arteries take blood away from the heart
• Arteries have thick walls and are more elastic than veins as they carry blood which is at a higher pressure than veins as they carry oxygenated
blood
• The channel the blood flows through, called the lumen, can widen to allow more blood through when you so that when you exercise, it can reach the working muscles
• The pulmonary artery is different from other arteries as it carries deoxygenated blood from the heart to the lungs

Question 4

Systolic phase

Answer 4

• The first phase is known as the systolic phase o This where bodis pumped from both atria into the ventricles (lub),
• Then both the ventricles contract (dub).

Question 5

Diastolic phase

Answer 5

• The second phase is known as the diastolic phase
o This is when the heart is relaxing and refilling with the atria with
blood.

Question 6

Red blood cells

Answer 6

Transports oxygen from the lungs to the body, they contain haemoglobin which stores oxygen in the blood cells, long distance events

Question 7

White blood cells

Answer 7

Defence system of the body, fight infections and diseases.

Question 8

Platelets

Answer 8

Formed in bone marrow, help blood clot and reduce bleeding, firs line of defence,

Question 9

Plasma

Answer 9

Take nutrients, hormones, protiens to parts of body which need it most, helps remove waste products

Question 10

Immune system

Answer 10

Structures and processes in your bodybtp stopndisease

Question 11

Thrombolinase

Answer 11

Substance invokved in blood clotting

Question 12

Serotonin

Answer 12

Triggers Clotting process

Question 13

Plasma

Answer 13

Fluid partbof blood

Question 14

Erythrocyte

Answer 14

Red blood cell

Question 15

Haemoglobin

Answer 15

Red protien in blood transports oxygen

Question 16

Anaemia

Answer 16

Condition where tehre is lack of res blood cells in the blood

Question 17

Leukocyte

Answer 17

White blood cell

Question 18

Pathogen

Answer 18

Agent that causes disease such as virus

Question 19

Antibody

Answer 19

Chemical that destroys a pathogen