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9. (a) (i) Why is the blood in the right side of the heart kept separate from the blood in the left? (ii) In relation to the heartbeat, what is meant by the term diastole? (b) Answer the following in relation to an investigation you carried out to dissect, display and identify the parts of a sheep's or an ox's heart - Leaving Cert Biology - Question 9 - 2020
Question 9
9. (a) (i) Why is the blood in the right side of the heart kept separate from the blood in the left? (ii) In relation to the heartbeat, what is meant by the term... show full transcript
Worked Solution & Example Answer:9. (a) (i) Why is the blood in the right side of the heart kept separate from the blood in the left? (ii) In relation to the heartbeat, what is meant by the term diastole? (b) Answer the following in relation to an investigation you carried out to dissect, display and identify the parts of a sheep's or an ox's heart - Leaving Cert Biology - Question 9 - 2020
Step 1
Why is the blood in the right side of the heart kept separate from the blood in the left?
Answer
The right side of the heart is responsible for pumping deoxygenated blood to the lungs for oxygenation, while the left side pumps oxygenated blood to the rest of the body. Keeping them separate ensures that oxygen-rich blood does not mix with oxygen-poor blood, which is crucial for maintaining effective circulation and respiratory efficiency.
Step 2
In relation to the heartbeat, what is meant by the term diastole?
Answer
Diastole refers to the phase of the heartbeat when the heart muscles relax. During this time, the chambers of the heart fill with blood. It is a critical phase that allows the heart to prepare for the next contraction.
Step 3
How did you identify the right hand side from the left hand side of the heart?
Answer
The right side of the heart is typically thinner and less muscular than the left side, as it only pumps blood to the lungs. The left side, in contrast, is thicker and firmer due to its role in pumping blood throughout the body.
Step 4
Step 5
Describe how you dissected the heart to identify the bicuspid valve.
Answer
We performed a shallow cut (incision) on the left side of the heart using a scalpel. This allowed us to carefully expose the internal structure, including the bicuspid valve, which is located between the left atrium and left ventricle.
Step 6
State the precise location of one semilunar valve and describe how you further dissected the heart to locate this valve.
Answer
One semilunar valve is located at the base of the pulmonary artery. To locate this valve, further dissection involved making an incision to open the heart and observe the junction between the ventricle and the pulmonary artery, allowing for clear visualization.