Unit 2 Review

What is the primary function of red blood cells (erythrocytes)?

• Oxygen transport

• Nutrient absorption

• Immune defense

• Blood clotting

Which of the following is responsible for blood clotting and wound healing?

• Platelets

• White blood cells

• Plasma

• Red blood cells

The heart's muscular wall, responsible for pumping blood, is called the:

• Pericardium

• Atrium

• Ventriculus

• Myocardium

The heart's normal pacemaker, which initiates electrical impulses, is called the:

• Atrioventricular (AV) node

• Sinoatrial (SA) node

• Bundle of His

• Purkinje fibers

Which ECG wave corresponds to atrial depolarization?

• P-wave

• QRS complex

• T-wave

• U-wave

In an ECG, what does the QRS complex represent?

• Atrial depolarization

• Ventricular depolarization

• Atrial repolarization

• Ventricular repolarization

Cardiac output is defined as:

• The volume of blood pumped per minute by each ventricle

• The number of heartbeats per minute

• The total blood volume in the circulatory system

• The volume of blood returning to the heart

Which of the following factors can increase cardiac output?

• Decreased heart rate

• Increased stroke volume

• Decreased contractility

• Constricted blood vessels

What is the term for the volume of blood in the ventricles at the end of ventricular diastole?

• End-systolic volume

• End-diastolic volume

• Stroke volume

• Cardiac output

Which type of blood vessel is responsible for exchanging nutrients and gases with tissues?

• Arteries

• Veins

• Capillaries

• Venules