Core 2: Circulatory

Question 1

Where is blood carried

Answer 1

Away from the heart via the arteries and into the heart vvia veins

Question 2

Role of valves

Answer 2

prevents blood from circulating backwards

Question 3

Role of red blood cells

Answer 3

Red blood cells (erythrocytesare formed in bone marrow– contains haemoglobin which is responsible for transporting oxygen from the lungs to the body tissues

Question 4

Role of white blood cells

Answer 4

Leukocytes fight infection and disease, they develop in bone marrow and lymph nodes

Question 5

Role of Platelets

Answer 5

Responsible for blood clots and prevents blood loss

Question 6

What is plasma

Answer 6

55% of blood is plasma but constructed of 90% water and 10% dissolved substances
- transports blood cells, digested foods and waste e.g glucose and carbon dioxide respecctively

Question 7

How does blood flow through the heart

Answer 7

Blood from the body enters through the right atrium and goes through the right ventricle and leaaves via the pulmonary artery to pick up O2 from lungs . Then travels back to heart via left atrium and through the left vventricle and through aorta

Question 8

What is stroke volume

Answer 8

The amount of blood pumped out of the left ventricles in one contraction and thus increases cardiac output

Question 9

What is cardiac output

Answer 9

The amount of blood pumped from the heart in one minute
= stroke volume x heart rate

Question 10

What is it called when muscles increase in size ith exercise

Answer 10

muscular hypertrophy