Unit 8, Part 1 REVIEW

What describes the role of the atrioventricular node of the heart?

• It causes the muscles of the ventricles to contract from the apex upwards

• It delays the transmission of a wave of electrical activity from the sinoatrial node

• It initiates a new wave of electrical activity in the ventricles

• It provides a non-conducting barrier between the atria and the ventricles

What is systolic blood pressure?

• The blood pressure in the arteries when the heart is relaxing

• The blood pressure in the left ventricle at the end of a contraction

• The maximum blood pressure in the arteries

• The maximum blood pressure in the right ventricle

Which statement explains why the ventricles contract after the atria?

• The band of fibers between the atria and the ventricles conducts the excitation wave slowly

• The excitation wave has to pass through a small area of conducting fibers in the septum

• The excitation wave has to travel further to reach the base of the ventricles than to spread across the atria

• The excitation wave travels slowly through the Purkyne tissue to reach the base of the septum

Three areas involved in the control of the heart action are listed.

1. Atrioventricular Node

2. Sinoatrial Node

3. Purkyne Tissue

In which order are they involved?

• 2 --> 3 --> 1

• 3 --> 2 --> 1

• 2 --> 1 --> 3

• 1 --> 3 --> 2

Node found in the septum of the right atrium and ventricle:

• Artery

• Sinoatrial Node

• Atrioventricular Node

• Semilunar Valves

Vessel that carries blood to the heart; thinner walls and thicker lumen:

• Vein

• Artery

• Ventricles

• Lymph

Tricuspid and Mitral Valves:

• Atrial Systole

• Atrioventricular Valves

• Semilunar Valves

• Lymph

Fluid that is transported within the lymphatic system; plays a role in immune response:

• Lymph

• Blood

• Tissue Fluid

• Ventricular Diastole

Stage of the cardiac cycle in which the ventricles forcefully contract to push blood out of the heart:

• Ventricular Diastole

• Ventricular Systole

• Atrioventricular Valves

• Semilunar Valves

Fluid composed of plasma and formed elements found exclusively in blood vessels:

• Lymph

• Tissue Fluid

• Sinoatrial Node

• Blood