The heart rate of a penguin decreases while it is swimming underwater. Heart rate is regulated by a group of specialised cells in the wall of the right atrium. The activity of these cells is modified by nerve impulses. Name the group of specialised cells in the wall of the right atrium that regulates heart rate. .........................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：9700_w24_qp_21 Year：2024 Question No：2(d)

Answer:

Knowledge points:

8.3.1 describe the external and internal structure of the mammalian heart

8.3.2.1 atria and ventricles

8.3.2.2 left ventricle and right ventricle

8.3.3 describe the cardiac cycle, with reference to the relationship between blood pressure changes during systole and diastole and the opening and closing of valves

8.3.4 explain the roles of the sinoatrial node, the atrioventricular node and the Purkyne tissue in the cardiac cycle (knowledge of nervous and hormonal control is not expected)

Answer:

Knowledge points:

Solution:

Related Question