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2.2 Animal tissues, organs and organ systems

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Question 50

A dog's heart pumps oxygenated blood around its body, and its valves work in the same way as valves in a human heart. A veterinary surgeon replaces a leaking valve with one that opens fully and closes fully.

What is the effect of the surgery on the dog's circulation?

[1]
A

More oxygenated blood is pumped around the body because the heart rate increases

B

Less oxygenated blood is pumped around the body because the closed valve blocks forward flow

C

More oxygenated blood is pumped around the body because backward flow is reduced

D

The volume of oxygenated blood pumped is unchanged because valves only control direction

Markscheme

2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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