Human Anatomy and Physiology I- Chapter 17 Homework
A patient has a heart rate of 70 beats per minute, an EDV of 110 ml, and an ESV of 70 ml. What is the patient's cardiac output?
2.8 L/minute
Identify the right atrium.
B
The aortic valve opens at __________.
B
The right side of the heart pumps deoxygenated blood into __________.
B
Certain drugs used to treat dysrhythmias, called local anesthetics, work by blocking voltage gated sodium ion channels and slowing the entry of sodium ions into the cell during an action potential. What effects would you see?
Decrease depolarization of the cell
Identify the pulmonary trunk.
E
Identify the mitral (bicuspid) valve.
G
Identify the papillary muscle.
I
Identify the left ventricle.
J
Identify the interventricular septum.
K
Heart tissue dies during a myocardial infarction (MI), and a person's survival and recovery depend on the extent of cell death and the chamber(s) involved. In which chamber would the loss of function be most damaging to survival?
Left Ventricle
Which of the following happens immediately after the P wave?
The atria contract.
What vessel delivers oxygenated blood to systemic capillaries for gas exchange?
aorta
The P wave on an electrocardiogram (ECG) represents the depolarization of cells in the:
atria
Which hormone decreases cardiac output by decreasing blood volume and preload?
atrial natriuretic peptide (ANP)
Autorhythmicity in the heart is the responsibility of:
cardiac pacemaker cells.
What largely determines preload?
end-diastolic volume (EDV)
The apex of the heart is __________.
inferior
What characteristic differentiates cardiac muscle cells from skeletal muscle cells?
intercalated discs
What surface groove separates the right and left ventricles?
interventricular sulcus
Unlike skeletal muscle action potentials, cardiac muscle action potentials __________.
involve calcium voltage-gated channels
The pulmonary circuit involves blood flow from the heart to the:
lungs
What vessel(s) deliver oxygenated blood to the left atrium?
pulmonary veins
What normally serves as the pacemaker of the entire heart?
sinoatrial (SA) node
What two values are needed in order to calculate cardiac output (CO) for a ventricle?
stroke volume (SV) and heart rate (HR)
The vessels that deliver oxygen to the tissues of the body are part of the __________.
systemic circuit
Which of the following events will immediately follow the phase of the cardiac cycle depicted in the figure?
the atrioventricular valves open.
Afterload is described as:
the force the ventricles must overcome to eject blood into their respective arteries.
The aortic valve closes when __________.
the pressure in the left ventricle falls below aortic pressure
What valve prevents the backflow of blood from the right ventricle into the right atrium?
tricuspid valve
Blood from the systemic circuit returns to the heart via the __________.
venae cavae
During what phase does blood flow from the ventricles into the pulmonary trunk and aorta?
ventricular ejection phase
