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
