Figure 2 shows a photograph of a dissected heart - AQA - A-Level Biology - Question 3 - 2019 - Paper 1
Question 3
Figure 2 shows a photograph of a dissected heart.
Name valve A and chamber B.
Valve A:
Chamber B:
Give two safety precautions that should be followed when dis... show full transcript
Worked Solution & Example Answer:Figure 2 shows a photograph of a dissected heart - AQA - A-Level Biology - Question 3 - 2019 - Paper 1
Step 1
Name valve A and chamber B.
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
Valve A: Left atrioventricular (bicuspid) valve
Chamber B: Left ventricle
Step 2
Give two safety precautions that should be followed when dissecting a heart.
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
Use a sharp scalpel or scissors to minimize the risk of cuts.
Wash hands and wear gloves to maintain hygiene.
Step 3
Explain how valve A in Figure 2 maintains a unidirectional flow of blood.
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
Valve A ensures a unidirectional flow of blood by opening when the pressure in the left atrium is higher than in the left ventricle, allowing blood to flow into the left ventricle. When the ventricle contracts, the pressure inside it rises above that of the atrium, causing the valve to close and preventing the backflow of blood into the atrium.
