Edexcel IGCSE Biology 2.65 The heart & how it functions
Practise using heart diagrams to identify chambers, vessels and valves, then link wall thickness and blood flow to heart function.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- label heart structures on diagrams, including septum, semi-lunar valves, chambers and vessels
- compare ventricle wall thickness with the pressure needed for lungs or the whole body
- explain how valve action maintains one-way blood flow and prevents backflow into ventricles
2.65 The heart and how it functions question 1
Aerobic respiration uses oxygen and produces ATP.
Question (a)
(a)
The structure of a frog heart is different from the structure of a human heart.
The diagram shows a section of a frog heart with arrows showing the direction of blood flow.
[ 6 ]
Question (i)
(i)
Give one difference between the structure of the frog heart and a human heart.
[ 1 ]
Question (ii)
(ii)
Humans can run for long periods of time. Frogs can only move for short periods of time.
Explain how the structure of the heart of a frog means that it is unable to move for long periods of time.
[ 5 ]
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