Quiz 2: Cardiovascular System

Which type of leukocyte releases histamine?

basophil

Vagal tone refers to the

decreasing heart rate below its inherent rhythm by parasympathetic stimulation

Old erythrocytes are phagocytized in the

liver and spleen

The "buffy coat" in a centrifuged blood sample is composed of

platelets and leukocytes

Which correctly describes the heart's apex?

projects slightly posteroinferiorly toward the left side of the body

Which carries oxygenated blood from the lungs to the heart?

pulmonary veins

In an ECG, what does the T wave represent?

repolarization of the ventricles

Which heart chambers contain deoxygenated blood?

rights atrium and right ventricle

The papillary muscles attach to the cusps of the atrioventricular valves by means of the

tendinous cords

If agglutination occurs after a blood transfusion, it may indicate

the wrong blood type was used

the first phase in hemostasis is

vascular spasm

The term "epicardium" is another name for the

visceral layer of the serosal pericardium

Which are characteristics of type A blood?

-has anti-B antibodies -has surface antigen A on its erythrocytes -will agglutinate with blood type B

During a cardiac cycle, how many of the four chambers contract at any one time?

2

What is the sequence of events in the transmission of an impulse through the heart muscle?

SA node Through the atria AV node AV bundle Bundle branches Purkinje fibers Through the ventricles

An individual's hematocrit would vary with

age, sex, altitude (all of the choices are correct)

The smallest and most abundant plasma proteins are the

albumins

The life span of an erythrocyte is about _______ days.

120

Select all that occur during the plateau phase of an action potential on a cardiac muscle cell

calcium is entering the cell potassium is exiting the cell

Which circuit of the cardiovascular system is responsible for sending blood to the kidneys, stomach, and pelvic regions?

systemic circuit