#1

I'd really appreciate it, if you guys can help me out and point me in the right direction...

Q.
During the cardiac cycle the pressure n the different chambers of the heart varies in a regular pattern

(I) In which chamber is the highest pressure generated?

Left Ventricle - is this correct?

(II) which chamber has the greatest pressure change?

Left ventricle - is this correct?

Q2.

If there is a graph like above, how would you work out the heart rate in beats per minute?

Here is what I did:
1 cardiac cycle = 0.6s
therefore in 60s, there will be 100 cardiac cycles (heart beats)...if this right or is there another way of doing it?

Now here is the bit that is worrying me....could someone please help me interpret the graph above, i am failing to understand properly what is happening at points A, B, C, and D.

EDIT: I am doing OCR As biology BTW
0
10 years ago
#2
Highest pressure - Left ventricle - to overcome the resistance of the systemic circulation as well as the blood needing to be pumped further. Also to deliver nutrients and remove waste products quickly to support the metabolic processes of the aerobically respiring tissues.
Correct.

Chamber with the greatest pressure change - Obvious to see from the graph it's the left ventricle. Correct.

Cardiac cycle - correct.
Heart rate min-1 = 60s/ time taken for 1 cardiac cycle

Interpreting the graph:

The part of the graph between time=0 and A is atrial systole

A = atrioventricular valves closing (tricuspid and bicuspid valves)
= ventricles beginning to contract (ventricular systole)

B = Semilunar valves opening

C = Semilunar valves closing

D = Atrioventricular valves opening

Between D and time=0.6s is diastole (recovery of the ventricles)

I hope that helps.
0
10 years ago
#3
You've done basically everything right.
0
#4
(Original post by COMMUNIST)
Highest pressure - Left ventricle - to overcome the resistance of the systemic circulation as well as the blood needing to be pumped further. Also to deliver nutrients and remove waste products quickly to support the metabolic processes of the aerobically respiring tissues.
Correct.

Chamber with the greatest pressure change - Obvious to see from the graph it's the left ventricle. Correct.

Cardiac cycle - correct.
Heart rate min-1 = 60s/ time taken for 1 cardiac cycle

Interpreting the graph:

The part of the graph between time=0 and A is atrial systole

A = atrioventricular valves closing (tricuspid and bicuspid valves)
= ventricles beginning to contract (ventricular systole)

B = Semilunar valves opening

C = Semilunar valves closing

D = Atrioventricular valves opening

Between D and time=0.6s is diastole (recovery of the ventricles)

I hope that helps.
ahh...thank you I just had problems understanding what is going on the graph, but now I understand how to interpret a graph like it

+ rep
0
10 years ago
#5
i remember actually answering that question on a Transport paper lol
0
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