A&P: Chapter 11

Which valve guards the base of the aorta and opens when the ventricles are contracting:

aortic semilunar valve

The aorta is classified as one of these vessels

arteries

These vessels carry blood away from the heart

arteries

These vessels have thicker walls and a heavier tunica media

arteries

These vessels return blood to heart

arteries

The path of blood flow within the systemic vascular system is:

arteries, arterioles, capillary beds, venules, veins

The atrioventricular node starts each heart beat and is often called the pacemaker of the heart for that reason.

False

which of these events is not associated with ventricular systole:

heart is relaxed

Veins:

often have valves to prevent the backflow of blood

The friction blood encounters as it flows through the vessels is called:

peripheral resistance

which one of the folling blood vessels carries oxygenated blood:

pulmonary veins

the sinoatrial node is located in the:

right atrium

Which one of the following is true concerning the "lub-dup" sounds of the heart:

the first sound is longer and louder and is caused by closure of the AV valves; the second sound is shorter and sharper and is caused by closure of the semilunar valves

A person with a heart rate of 75 beats per minute and a stoke volume of 60 mL per beat has a cardiac output of:

4500 mL/ minute

Arteries always carry blood away from the heart

True

The part of the intrinsic conduction system of the heart that directly supplies the walls of the ventricles is the Purkinje fibers.

True

Nutrient and gas exchange occur in these vessels

capillaries

Venules drain these tiny vessels

capillaries

Which of the following increases heart rate:

epiephrine

Cardiac output is calculated by multiplying the stroke volume by the systolic blood pressure.

false

The semilunar valves prevent the backflow of blood into the atria when the ventricles are contracting.

false

What structure divides the left from the right ventricle:

interventricular septum

the pointed apex of the heart is oriented toward the:

left hip

Pulmonary circulation involves blood flow to and from the heart and the:

lungs

correct path for the transmission of an impulse in the intrinsic conduction system of the heart

sinoatrial (SA) node, atrioventricular (AV) node, atrioventricular (AV) bundle, right and left bundle branches, Purkinje fibers

The volume of blood pumped out by each ventricle with each beat of the heart is called the:

stroke volume

Deoxygenated blood is returned to the right side of the heart of the:

superior and inferior vena cavae

Pulmonary veins;

transport oxygenated blood to the heart

An increase in blood vessel diameter causes arterial blood pressure to decrease.

true

The average heart beats approximately 75 times each minute at rest.

true

Blood pressure in these vessels is low

veins

Some of these larger vessels have valves to prevent backflow

veins

Superior and inferior vena cava are classified as these types of vessels

veins

These vessels have thinner walls and transport oxygen-poor blood

veins