Cardiac muscles works continuously in response to signals from an area of the heart called pacemaker.
Oxygen is carried to cells as oxyhaemoglobin.
There are about 10 million red blood cells in one drop of blood.
The average-sized adult has 5 litres of blood.
Question 3
Question
A blood clot in the blood vessels of the heart can cause [blank_start]angina[blank_end] and [blank_start]heart attack[blank_end].
Answer
angina
heart attack
Question 4
Question
A blood contains
Answer
Red blood cells
White blood cells
Platelets
Plasma
Question 5
Question
Plasma is a clear yellowish liquid found in the stomach which is 90% water and 10% dissolved materials.
Answer
True
False
Question 6
Question
Oxygenated blood means blood rich in oxygen
Answer
True
False
Question 7
Question
Three main phases of a heartbeat
Answer
The two atria contract, pushing blood down into the ventricles.
The heart muscle relaxes and the atria fill with blood.
The ventricles contract, forcing blood out of the heart to the body and lungs.
Question 8
Question
[blank_start]Cholesterol[blank_end] is a type of fat that is part of all animal cells. When cholesterol builds up in [blank_start]coronary arteries[blank_end], blood flow to the heart muscles reduced. This also means that oxygen supply is reduced.
Answer
Cholesterol
coronary arteries
capillaries
plasma
Unsaturated fat
Question 9
Question
The heart has [blank_start]four chambers[blank_end]. Two of them collect blood from the [blank_start]lungs[blank_end] and pump it round the body. The other two collect blood from the [blank_start]body[blank_end] and pump it to the lungs.
Answer
four chambers
lungs
body
Question 10
Question
There are three types of blood vessels
Answer
Capillaries
Arteries
Veins
Atria
Question 11
Question
[blank_start]Veins[blank_end] carry blood back to the heart. [blank_start]Arteries[blank_end] carry blood away from the heart. [blank_start]Capillaries[blank_end] are the finest of the blood vessel.
Answer
Veins
Arteries
Capillaries
Question 12
Question
Haemoglobin is a green pigment that gives the colour of plants
Answer
True
False
Question 13
Question
[blank_start]Angina[blank_end] is a condition of lacking oxygen to the heart muscle.
Answer
Angina
Question 14
Question
There are only about 400 000 [blank_start]white blood cells[blank_end] in a drop of blood.
Answer
white blood cells
Question 15
Question
Red blood cells, white blood cells and platelets are condensed in plasma.