245 A&P Quiz 1B

What is the mean pulmonary capillary pressure?

• 4-6 mmHg
• 15-20 mmHg
• 25-30 mmHg
• 15 mmHg

What is the mean arterial pressure that drives the systemic circulation?

• MAP = systolic pressure + 1/3(diastolic pressure - systolic pressure)
• 95 mm Hg

• MAP = systolic pressure + diastolic pressure
• MAP = diastolic pressure - 1/3(systolic pressure - diastolic pressure)

Which part of the heart divides muscle fibers into an inflow tract and an outflow tract?

• aortic valve
• pulmonary valve
• atrial septum
• Ventricle

What is the name of the dense fibrous tissue that provides an anchorage for attachments of atrial and ventricular musculature and valvular tissue in the heart?

• endocardium
• myocardium
• pericardium
• Annuli fibrosi cordis

Answer explanation

the fibrous skeleton of the heart are composed of four rings of dense fibrous tissue and provide a firm anchorage for attachments of the atrial and  ventricular musculature and valvular tissue. This fibrous skeleton is called the annuli fibrosi cordis.

What ensures one-way blood flow through the heart?

• blood vessels
• lungs
• muscles
• 4 heart valves

Which valves open during ventricular relaxation, allowing blood to flow from the atria to the relaxed ventricles?

• Mitral valves
• Semilunar valves
• Pulmonary valves
• Atrioventricular (AV) valves

Contraction of the left ventricle is slightly earlier than the contraction of the right ventricle.

• True

• False

When do semilunar valves open?

• When the heart is at rest.
• When the atria contract.
• When the pressure in the arteries exceeds the pressure in the ventricles.
• When intraventricular pressure exceeds aortic and pulmonary pressure

What is the primary function of pulmonic and aortic semilunar valves?

• Regulate blood pressure
• Control heart rate
• Filter impurities from the blood
• To prevent backflow into the right and left ventricles

What happens after ventricular contraction and ejection?

• The ventricles contract and pump blood into the atria during systole.
• The ventricles remain contracted and do not relax.
• The ventricles fill with blood from the veins during systole.
• Intraventricular pressure falls and the pulmonic and aortic semilunar valves close,