1. Figure 1 shows a diagram of the heart - Edexcel - GCSE Biology Combined Science - Question 1 - 2020 - Paper 1
Question 1
1. Figure 1 shows a diagram of the heart.
(a) (i) Draw arrows on Figure 1 to show how oxygenated blood moves through the heart. (1)
(ii) What happens when the righ... show full transcript
Worked Solution & Example Answer:1. Figure 1 shows a diagram of the heart - Edexcel - GCSE Biology Combined Science - Question 1 - 2020 - Paper 1
Step 1
Draw arrows on Figure 1 to show how oxygenated blood moves through the heart.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To indicate the movement of oxygenated blood through the heart, arrows should be drawn starting at the left ventricle, moving through the aorta, then towards the body tissues where the blood loses oxygen and becomes deoxygenated. The sequence is as follows:
Draw an arrow from the left ventricle to the aorta.
Continue the arrow from the aorta to the arteries leading to various body tissues.
Step 2
What happens when the right ventricle contracts?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
When the right ventricle contracts, valve T closes, preventing backflow and ensuring that blood is forced into the pulmonary artery for oxygenation in the lungs. Therefore, the correct answer is B: valve T closes.
Step 3
Draw one straight line from each structure to its function.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The lines connecting structures to their functions are as follows:
Pulmonary vein: carries blood from the lungs to the heart.
Left ventricle: forces blood towards the lungs.
Step 4
Explain how the valves in veins help the blood, at low pressure, flow towards the heart.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The valves in veins play a crucial role in maintaining unidirectional blood flow towards the heart. As blood in veins is under low pressure, these valves close to prevent backflow, ensuring that blood continues to move forward to the heart.
Step 5
State why this equipment was put into disinfectant.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The equipment was put into disinfectant to eliminate any potential pathogens or contaminants, ensuring that it is sterile and safe for use in dissection.
