Circulatory system study guide

Which of the following is not true of thrombocytes? a. Thrombocytes lack a nucleus b. Thrombocytes are required for the clotting process c. Thrombocytes vary in shape and size d. Thrombocytes fight infection

Thrombocytes fight infection

Electrical impulses originating in the heart cause the cyclic contraction of the muscles.

True

The period of ventricular contraction in the heart is called diastole.

False

The muscle layer of the heart is the ____. a. endocardium c. ectocardium b. pericardium d. myocardium

Myrocardium

The bright red color of blood indicates ____. a. anemia c. hemoglobin-carrying oxygen b. venous blood d. fibrinogen-carrying oxygen

hemoglobin-carrying oxygen

Name five things that blood transports through the body.

oxygen, carbon dioxide, nutrients, heat, hormones

The chamber of the heart that receives deoxygenated blood as it returns from body cells is the ____. a. right atrium c. left atrium b. right ventricle d. left ventricle

right atrium

Trace the pathway of the electrical impulse in the heart, listing all parts of the pathway in the correct order.

sinoatrial (SA) node, pathways in atria, atrioventricular (AV) node, bundle of His, right and left bundle branch, Purkinje fibers

The valve between the right atrium and right ventricle that prevents blood from flowing back into the right atrium is the ____. a. tricuspid valve c. aortic valve b. pulmonary valve d. mitral valve

tricuspid valve

Arrhythmias are abnormal heart rhythms and can be mild to life threatening.

true

Capillaries allow oxygen and nutrients to pass through to body cells.

true

Capillaries have thin walls containing only one layer of cells.

true

Hemoglobin carries both oxygen and carbon dioxide.

true

The movement of the electrical impulse in the heart can be used to detect abnormal activity or disease.

true

The smallest branches of arteries are called arterioles.

true

The blood vessels that contain valves to prevent blood from flowing in a backward direction are the ____. a. arteries c. capillaries b. veins d. arterioles

veins

The valve between the left atrium and left ventricle that prevents blood from flowing back into the left atrium is the ____. a. tricuspid valve c. aortic valve b. pulmonary valve d. mitral valve

mitral valve

A normal thrombocyte count per cubic millimeter of blood is ________. a. 100,000 to 200,000 c. 300,000 to 500,000 b. 250,000 to 400,000 d. 450,000 to 550,000

250,000 to 400,000

How much blood does the average adult have in his or her body? a. 2 to 4 quarts c. 6 to 8 pints b. 4 to 6 quarts d. 3 to 4 gallons

4 to 6 quarters

The number of erythrocytes in one cubic millimeter of blood is ____. a. 250,000 to 400,000 c. 4.5 to 5.5 million b. 5,000 to 10,000 d. 25 trillion

4.5 to 5.5 million

During diastole, the atria are filling with blood and the ventricles contract.

False

The largest artery in the body is the ____. a. carotid c. aorta b. femoral d. coronary

aorta

The blood vessels that are more muscular and elastic than are the other blood vessels are the ____. a. arterioles c. capillaries b. venules d. arteries

arteries

The blood vessels that carry blood away from the heart are the ____. a. arteries c. venules b. veins d. capillaries

arteries

The blood cells that contain hemoglobin are the ____. a. leukocytes c. erythrocytes b. platelets d. thrombocytes

erythrocytes

Which of the following is not a risk factor that increases the incidence of hypertension?

excessive exercise

Hypotension is high blood pressure.

false

Neutrophils, monocytes, thrombocytes, and lymphocytes are all different types of leukocytes.

false

Trace a drop of blood through the heart, to the lungs, and back to the heart. Name the blood vessels carrying the blood, the valves, and all chambers of the heart.

inferior and superior vena cava, right atrium, tricuspid valve, right ventricle, pulmonary valve, pulmonary arteries, lungs, pulmonary veins, left atrium, mitral valve, left ventricle, aortic valve, aorta, arteries, arterioles, capillaries, body cells, venules, veins

The chamber of the heart that receives oxygenated blood as it returns from the lungs is the ____. a. right atrium c. left atrium b. right ventricle d. left ventricle

left atrium

The blood cells that fight infection are the ____. a. erythrocytes c. thrombocytes b. leukocytes d. platelets

leukocytes

The leukocytes that provide immunity for the body by developing antibodies and protect against the formation of cancer cells are? a. neutrophils c. basophils b. lymphocytes d. eosinophils

lymphocytes