The average normal pH of blood is

• 8.4

• 7.8

• 7.4

• 6.8

Red blood cells survive for around _______ days.

• 120

• 240

• 10

• 360

Neutrophils, eosinophils, and basophils are alike in that they

• are granulocytes.

• release histamine.

• are the only phagocytic leukocytes.

• lack a defined nucleus.

The heart is specifically located in the

• thoracic cavity.

• mediastinum.

• pleural cavity.

• ventral cavity.

The membrane that is closest to the heart muscles is the

• pericardial sac.

• fibrous pericardium.

• parietal pericardium.

• visceral pericardium.

The left ventricular wall of the heart is thicker than the right wall in order to

• accommodate a greater volume of blood.

• expand the thoracic cage during diastole.

• pump blood with greater pressure.

• pump blood through a smaller valve.

The pacemaker of the heart is in the

• posterior of the left atrium.

• anterior of the left atrium.

• posterior of the right atrium.

• anterior of the right atrium.

Blood vessels that return blood from the lungs back into the heart are the

• right and left pulmonary veins.

• right and left pulmonary arteries.

• superior and inferior venae cavae.

• coronary arteries.

The tunic that is involved in vasodilation and vasoconstriction of blood vessels is the

• tunica intima.

• tunica externa.

• tunica media.

• tunica adventitia.

The ___________ are involved in the pulmonary circulation.

• superior vena cava, right atrium and left ventricle

• inferior vena cava, right atrium and left ventricle

• left ventricle, aorta, and inferior vena cava

• right ventricle, pulmonary artery and left atrium