WUQ #5 Questions

T or F: All veins carry deoxygenated blood.

False

Which of the following denotes the correct order of activity in the cardiac conducting system? a. SA node - AV node - Bundle of His - L/R bundle branches - Purkinje fibers b. SA node - Bundle of His - AV node - L/R bundle branches - Purkinje fibers c. SA node - AV node - L/R bundle branches, Bundle of His - Purkinje fibers d. AV node - SA node - Bundle of His - L/R bundle branches - Purkinje fibers e. AV node - Bundle of His - L/R bundle branches - Purkinje fibers - SA node

a. SA node - AV node - Bundle of His - L/R bundle branches - Purkinje fibers

The "dub" of the "lub-dub" sound the heart makes is caused by the: a. closing of the semilunar valves b. closing of the atrioventricular valves c. sound of blood rushing into the atria d. sound of blood rushing into the ventricles e. none of the answers

a. closing of the semilunar valves

The type of leukocyte that is very active during parasitic infection or allergies is the: a. eosinophil b. basophil c. lymphocyte d. neutrophil e. monocyte

a. eosinophil

One of the unhealthy effects of blood doping is to : a. increase the viscosity of blood b. increase the oxygen carrying capacity of blood c. decrease the blood pressure in the arteries d. decrease the oxygen carrying capacity of blood e. increase the carbon dioxide carrying capacity of blood

a. increase the viscosity of blood

A network of small arteries called the _____________ provide a blood supply to the tunica externa of very large vessels. a. distributing arteries b. vasa vasorum c. companion vessels d. fenestrated arteries e. thoroughfare channels

b. vasa vasorum

Which of the artery types contain the internal and external elastic laminae? a. elastic arteries b. arterioles c. muscular arteries d. elastic and muscular arteries e. elastic arteries and arterioles

c. muscular arteries

the endothelial layer of the endocardium is composed of: a. stratified squamous epithelium b. stratified cuboidal epithelium c. simple squamous epithelium d. simple cuboidal epithelium e. simple columnar epithelium

c. simple squamous epithelium

The lifespan of an erythrocyte is approximately: a. 30 days b. 60 days c. 90 days d. 120 days e. equal to the lifespan of the organism

d. 120 days

Which most closely approximates the percentage of water in plasma? a. 1% b. 25% c. 46% d. 92% e. 100%

d. 92%

Leukocytes have the ability to migrate from the bloodstream to the site of infection in surrounding tissue. This process is known as: a. hemopoiesis b. chemotaxis c. erythropoiesis d. diapedesis e. diuresis

d. diapedesis

Which leukocytes are derived from the lymphoid line of hemopoietic stem cells? a. neutrophils and lymphocytes b. basophils, eosinophils, and lymphocytes c. lymphocytes and monocytes d. lymphocytes e. neutrophils, basophils, eosinophils, and monocytes

d. lymphocytes

elastic arteries: a. are also called muscular arteries b. always contain deoxygenated blood c. are medium-sized arteries d. restrict blood flow due to force needed to stretch their walls e. include the largest diameter arteries in the body

e. include the largest diameter arteries in the body

Which valve prevents backflow of blood into the left ventricle when the ventricles relax? a. left A/V valve b. right A/V valve c. aortic semilunar valve d. pulmonary semilunar valve e. tricuspid valve

e. tricuspid valve

T or F: Autonomic centers in the brainstem cannot initiate the heartbeat, but cann increase/decrease the heart rate.

true