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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 te... 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
Blood in the right side of the heart is kept separate from the left to maintain the distinction between oxygenated and deoxygenated blood. This separation prevents mixing, allowing for efficient blood circulation and ensuring that oxygen-rich blood is delivered to the body while deoxygenated blood is directed towards the lungs for oxygenation.
Step 2
In relation to the heartbeat, what is meant by the term diastole?
Answer
Diastole refers to the relaxation phase of the heart cycle when the heart muscles relax and the chambers of the heart fill with blood. During this phase, the atria and ventricles expand, allowing blood to flow from the veins into the heart.
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 can be identified as being thicker and firmer than the left side. Additionally, the anatomical features and the orientation of vessels can help distinguish between the two sides.
Step 4
Step 5
Describe how you dissected the heart to identify the bicuspid valve.
Answer
To identify the bicuspid valve, I performed a shallow incision on the anterior side of the heart using a scalpel, allowing access to the left atrium. I then examined the left side of the heart carefully, focusing on the valve 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, I dissected further by cutting into the aorta or into the pulmonary artery to observe the structure and ensure correct identification.