Ch 18. Heart and Cardiovascular Function
veins.
Blood pressure is lowest in the
pulmonary veins.
The right atrium receives blood from all of the following except the
right and left lungs.
The right ventricle pumps blood to the
capillary hydrostatic pressure.
The vascular pressure that declines from roughly 35 mm Hg to about 18 mm Hg is the
epicardium.
The visceral pericardium is the same as the
right ventricle
The wall(s) of the ________ rest(s) on the diaphragm.
reduces; increases
Venoconstriction ________ the amount of blood within the venous system, which ________ the volume in the arterial and capillary systems.
isovolumetric contraction
What occurs at the circled label "4" on the graph?
when the peripheral vessels constrict
When will the blood pressure be greater?
artery
Where is blood pressure highest?
a trained athlete
Which of the following would you expect to have the lowest resting heart rate?
Both parts of the statement are true
Which parts of the following statement are true?The AV node delivers the stimulus to the AV bundle, located within the interventricular septum.
Autoregulation
________ is the regulation of blood flow by local mechanisms within a capillary bed.
circulatory shock
After losing 25 percent of blood volume in a motorcycle accident, which of the following compensatory responses would not occur?
stroke volume.
Analyzing of the electrocardiogram can reveal all of the following except the
The left ventricle does more work than the right ventricle.
Comparing the left ventricle with the right ventricle, which of the following is true?
decrease heart rate.
Drugs that block the beta-one adrenergic receptors will
atrioventricular valves and semilunar valves are closed.
During the isovolumetric contraction phase of ventricular systole, the
AV valves are closed.
During ventricular systole, the
ventricular diastole.
The relaxation phase of the lower chambers of the heart is called
increased hematocrit.
Each of the following changes will result in increased blood flow to a tissue except
increased parasympathetic stimulation.
Each of the following factors will increase cardiac output except
increased levels of ANP (atrial natriuretic peptide).
Each of the following will cause an increase in blood pressure except
regurgitation back into the right atrium
If a patient's tricuspid valve was leaking during systole, what would happen?
the ventricles will beat more slowly.
If the connection between the SA node and AV node becomes blocked,
a vessel 10 microns in diameter
In which of the following would the resistance be greater?
cardiac muscle cells.
Most of the middle layer in the heart wall is composed of
medulla oblongata.
Sensory neurons that are part of chemoreceptor reflexes that detect changes in carbon dioxide, oxygen, or pH levels in blood and cerebrospinal fluid are found in the
the refractory period lasts until the muscle relaxes
Tetanic muscle contractions don't occur in a normal cardiac muscle because
depolarization of the atria
The P wave of the electrocardiogram is a signal from
right coronary artery and left coronary artery
The ________ deliver(s) blood to the myocardium.
end-systolic volume
The ________ is the amount of blood in a ventricle after it has contracted and before it begins to refill.
interventricular septum
The ________ separate(s) the two ventricles.
in one direction only.
The atrioventricular valves permit blood flow
between the left atrium and left ventricle.
The bicuspid, or mitral, valve is located
concentration of plasma proteins.
The blood colloid osmotic pressure mostly depends on the
pericardial cavity.
The cavity that contains only the heart is the
pulse
The difference between the systolic and diastolic pressures is called the ________ pressure.
auricle
The earlike extension of the atrium is the
Coronary
The first blood vessels to branch from the aorta are the ________ arteries.
both parasympathetic and sympathetic
The heart is innervated by ________ nerves.
6,000
The heart pumps approximately ________ milliliters of blood each minute.
aorta
The left ventricle pumps blood to the
arteriole.
The main control of peripheral resistance by the vasomotor centers occurs in the
lungs.
The pulmonary arteries carry blood to the
