The mammalian circulatory system transports vital respiratory gases, nutrients, and waste products. It comprises the blood, blood vessels, and the heart.
Blood plasma is the liquid component of blood that acts as a solvent for many biological substances. Identify two specific chemical substances, other than glucose, that are transported dissolved in the blood plasma.
Erythrocytes (red blood cells) are highly specialized to optimize gas transport. Explain how two structural adaptations of an erythrocyte allow it to transport oxygen efficiently.
The diagram below shows cross-sections of a typical muscular artery and a vein:
Contrast the structure of an artery with that of a vein, referring to the features shown in the diagram and their physiological roles.
2.2 Animal tissues, organs and organ systems Questions
Practise AQA GCSE Biology 2.2 Animal tissues, organs and organ systems with exam-style questions for Foundation and Higher tier. 70 questions 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, matched to the AQA GCSE Biology (8461) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.