A-Level Biology Specification

OCR B H422

Section 2.2.2: Transport systems in mammals

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#2.2.2a

the importance of the closed double circulatory system

To include reference to blood pressure in systemic and pulmonary systems.

#2.2.2b

(i) the structure and functions of arteries, arterioles, capillaries, venules and veins

(ii) transverse sections of arteries, veins and capillaries as observed using a light microscope

Prepared slides or photomicrographs may be examined to show the structural differences between these vessels.

#2.2.2c

the formation and importance of tissue fluid

To include references to HP (hydrostatic pressure) and OP (oncotic pressure or colloidal osmotic pressure).

#2.2.2d

(i) the use of a sphygmomanometer to measure systolic and diastolic blood pressure

To include reference to both manual and electronic measuring.

(ii) comparisons of blood pressure readings

#2.2.2e

the interpretation of systolic and diastolic blood pressure measurements

To include hypertension and hypotension and their possible consequences.