AQA GCSE BIOLOGY - PAPER 1 EXAM (2024|2025) ACTUAL
COMPLETE 250 REAL EXAM QUESTIONS WITH CORRECT
ANSWERS/ALREADY GRADED A+/NEWEST UPDATE .
What happens on the left side of the heart? - ANSWER-
Oxygenated blood flows in through the pulmonary vein and
into the left atrium. The atrium contracts and pushes the blood
through the bicuspid valve, into the left ventricle. The valve
closes and the ventricle contracts to push the blood through
the left semi-lunar valve. The valve will then close and the
blood flows out of the aorta to all the cells in the body for gas
exchange
How does the heart pump blood around the body? - ANSWER-
Blood flows into the two atria from the vena cava (right atrium)
and the pulmonary vein (left atrium). The atria contract,
pushing the blood into the ventricles through valves.
The ventricles contract and force the blood through more
valves into the pulmonary artery (right ventricle) and the aorta
(left ventricle) and out of the heart
What are the three types of blood vessels? - ANSWER-Arteries,
capillaries and veins
,What do arteries do? - ANSWER--They carry blood under high
amounts of pressure
-Their walls are strong, elastic and thick
-They have the smallest lumens
-They contain thick layers of muscle to make them strong and
elastic fibres to allow them to stretch and spring back
What do capillaries do? - ANSWER--Arteries branch into
capillaries
-They are really tiny - too small to see
-They carry blood really close to every cell in the body to
exchange substances with them
-They have permeable walls - substances can diffuse in and out
-They supply food and oxygen and take away waste like carbon
dioxide
-Their walls are one cell thick - this increases the rate of
diffusion
What do veins do? - ANSWER--Capillaries join up to form veins
-The blood is at low pressure in the veins so the walls aren't as
thick as an artery's
-They have the biggest lumen to help the blood flow despite the
lower pressure
,-They have valves to help keep the blood flowing in the right
direction
What is the rate of blood flow? - ANSWER-Volume of blood
divided by the number of minutes
What are the four components of blood? - ANSWER-Red blood
cells, white blood cells, platelets and plasma
What do red blood cells do? - ANSWER--They carry oxygen
from the lungs to all the cells in the body
-They have a biconcave disc shape - creates a large surface
area and allows them to fit through capillaries
-They have no nucleus - can store even more oxygen
-They contain haemoglobin - this binds to oxygen to form
oxyhaemoglobin
What do white blood cells do? - ANSWER--They can change
shape to ingest microbes - this process is phagocytosis -
Others produce antibodies to fight microbes
-Some produce antitoxins to neutralise any toxins produced by
the microbes -They have a nucleus
What do platelets do? - ANSWER--They are small fragments of
cells that have no nucleus
, -They help the blood to clot at a wound - stops blood pouring
out and microbes getting into your bloodstream
-Lack of platelets can cause excessive bleeding and bruising
What does plasma do? - ANSWER-Plasma carries:
-red blood cells
-white blood cells
-glucose
-amino acids
-carbon dioxide
-urea
-hormones
-proteins
-antibodies
-antitoxins
What are stents? - ANSWER--Tubes that are inserted inside
arteries to keep them open which allows the blood to pass
through to the heart muscles -They lower the risk of a heart
attack in people with coronary heart disease
-They are effective for a long time
-There is a risk of infection from surgery and the patient could
develop a blood clot near the stent - thrombosis
COMPLETE 250 REAL EXAM QUESTIONS WITH CORRECT
ANSWERS/ALREADY GRADED A+/NEWEST UPDATE .
What happens on the left side of the heart? - ANSWER-
Oxygenated blood flows in through the pulmonary vein and
into the left atrium. The atrium contracts and pushes the blood
through the bicuspid valve, into the left ventricle. The valve
closes and the ventricle contracts to push the blood through
the left semi-lunar valve. The valve will then close and the
blood flows out of the aorta to all the cells in the body for gas
exchange
How does the heart pump blood around the body? - ANSWER-
Blood flows into the two atria from the vena cava (right atrium)
and the pulmonary vein (left atrium). The atria contract,
pushing the blood into the ventricles through valves.
The ventricles contract and force the blood through more
valves into the pulmonary artery (right ventricle) and the aorta
(left ventricle) and out of the heart
What are the three types of blood vessels? - ANSWER-Arteries,
capillaries and veins
,What do arteries do? - ANSWER--They carry blood under high
amounts of pressure
-Their walls are strong, elastic and thick
-They have the smallest lumens
-They contain thick layers of muscle to make them strong and
elastic fibres to allow them to stretch and spring back
What do capillaries do? - ANSWER--Arteries branch into
capillaries
-They are really tiny - too small to see
-They carry blood really close to every cell in the body to
exchange substances with them
-They have permeable walls - substances can diffuse in and out
-They supply food and oxygen and take away waste like carbon
dioxide
-Their walls are one cell thick - this increases the rate of
diffusion
What do veins do? - ANSWER--Capillaries join up to form veins
-The blood is at low pressure in the veins so the walls aren't as
thick as an artery's
-They have the biggest lumen to help the blood flow despite the
lower pressure
,-They have valves to help keep the blood flowing in the right
direction
What is the rate of blood flow? - ANSWER-Volume of blood
divided by the number of minutes
What are the four components of blood? - ANSWER-Red blood
cells, white blood cells, platelets and plasma
What do red blood cells do? - ANSWER--They carry oxygen
from the lungs to all the cells in the body
-They have a biconcave disc shape - creates a large surface
area and allows them to fit through capillaries
-They have no nucleus - can store even more oxygen
-They contain haemoglobin - this binds to oxygen to form
oxyhaemoglobin
What do white blood cells do? - ANSWER--They can change
shape to ingest microbes - this process is phagocytosis -
Others produce antibodies to fight microbes
-Some produce antitoxins to neutralise any toxins produced by
the microbes -They have a nucleus
What do platelets do? - ANSWER--They are small fragments of
cells that have no nucleus
, -They help the blood to clot at a wound - stops blood pouring
out and microbes getting into your bloodstream
-Lack of platelets can cause excessive bleeding and bruising
What does plasma do? - ANSWER-Plasma carries:
-red blood cells
-white blood cells
-glucose
-amino acids
-carbon dioxide
-urea
-hormones
-proteins
-antibodies
-antitoxins
What are stents? - ANSWER--Tubes that are inserted inside
arteries to keep them open which allows the blood to pass
through to the heart muscles -They lower the risk of a heart
attack in people with coronary heart disease
-They are effective for a long time
-There is a risk of infection from surgery and the patient could
develop a blood clot near the stent - thrombosis
