Human Anatomy and Physiology Answers

3.2 Why does the left ventricle have a thicker wall than the right ventricle?
a. A more muscular wall is required to supply the pumping that powers the flow
of blood into the pulmonary circuit.
b. A more muscular wall is required to supply the pumping that powers the flow
of blood into the systemic circuit.
c. The position of the heart in the chest cavity allows for the left ventricle to
develop a thicker wall than the right ventricle
d. The left ventricle is responsible for systole, while the right ventricle is
responsible for diastole.
e. The left ventricle contains the pacemaker.

3.2 iv. Discuss how these cells bring about the synchronised contraction of the heart:
Type –one cells (typified by those in the Sino atrial node); Type-two cells (typified by those in the ventricular endocardium); Type –three cells (typified by those that comprise the bulk of the heart)

List the attributes of the following heart cell types:
i. Type –one cells (typified by those in the Sino atrial node)
ii. Type-two cells (typified by those in the ventricular endocardium)
iii. Type –three cells (typified by those that comprise the bulk of the heart)

3.2
d) Describe blood flow in a foetus undergoing right to left shunt.

3.2 What is a shunt due to? (Answer this with respect to specific examples)

3.2 When does a shunt occur?

3.2 Select the correct regions of the circulatory system from the list below and list them in the
correct order to map the route that blood takes in the circulatory system of: A human foetus right to left shunt.

A. Arterial part of pulmonary system
B. Arterial part of systemic system
C. Capillary beds in lungs
D. Capillary beds in body
E. Left atrium
F. Left ventricle
G. Right atrium
H. Right ventricle
I. Venous part of pulmonary system
J. Venous part of systemic system

3.2 Differentiate between tachycardia and bradycardia.