Question

(a) Fig. 1.1 shows medical notes from a person at risk of developing coronary heart disease (CHD).

(i) Complete this sentence about coronary heart disease.
Coronary heart disease is caused by a ………………………………….. of the coronary arteries. 
(ii) Use Fig. 1.1 to state two ways that the person can reduce their risk of developing coronary heart disease.
1 ……………………………………………………………………………………………………………………….
2 ……………………………………………………………………………………………………………………….
(iii) The person cannot control one of the factors in Fig. 1.1 that puts them at greater risk of developing coronary heart disease.

Identify this factor.

…………………………………………………………………………………………………………………….

(b) Fig. 1.2 is a photomicrograph of a cross-section of an artery.

(i) Describe and explain the adaptations of the feature labelled X in Fig. 1.2 for the transport of blood.
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….

(ii) State the type of circulation that mammals have.

………………………………………………………………………………………………………………………….

▶️Answer/Explanation

Ans:  1(a)(i) blockage ; 
1(a)(ii) stop smoking ;
do more exercise ;

1(a)(iii) age ; 
1(b)(i) thick wall ;
to withstand high blood pressure ;
elastic / muscular, wall ;
able to stretch and recoil / maintain (high) blood pressure ;

1(b)(ii) double (circulatory system) ;