Anatomy Chapter 11
Explain the role of valves in heart functioning.
The valves prevent the backward flow of blood. They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.
The sinoatrial (SA) node is indicated by ________
Label A
The atrioventricular (AV) node is indicated by ________
Label B
The bundle branches are indicated by ________.
Label D
When the ventricles contract, the bicuspid (mitral) valve prevents blood from flowing from the:
left ventricle to the left atrium
What is the effect of parasympathetic nervous system control on the vascular system?
little to no effect
The layer of the heart wall that receives the stimulus from letter E is called the ________.
myocardium
Veins ________.
often have valves to prevent the backflow of blood
Blood leaves the left ventricle through an artery known as the ________.
aorta
The path of blood flow within the systemic vascular system is ________.
arteries, arterioles, capillary beds, venules, veins
The two superior receiving chambers of the heart are known as the ________, while the twoinferior discharging chambers of the heart are known as the ________
atria; ventricles
The valves located between the atria and ventricles are known as the ________ valves.
atrioventricular (AV)
The heart sounds "lub" and "dup" result from ________.
closure of heart valves
The correct sequence of layers of a typical blood vessel, from superficial to deep, are________.
tunica externa, tunica media, tunica intima
Which of the following vessels has the lowest blood pressure?
venae cavae
Which fetal shunt bypasses the lungs by directly connecting the right atrium and the left atrium?
foramen ovale
The sinoatrial (SA) node is the pacemaker of the intrinsic conduction system of the heart
true
arteries branch into smaller vessels known as arterioles
true
Match the following: 1. Heart chamber with the thickest wall 2. Inferior discharging chamber on the left side of the heart 3. Heart chamber that pumps blood to the pulmonary trunk 4. Heart chamber that contains the sinoatrial node
1. left ventricle 2. left ventricle 3. right ventricle 4. right atrium
1. Blood is ejected from the ventricles through the pulmonary trunk and aorta 2. Ventricular relaxation
1. systole 2. diastole
Amanda is exercising and noticed her heart rate has nearly doubled from her resting heart rate of 68 beats per minute. Explain what effects her increased heart rate will have on cardiac output and stroke volume, if any.
During exercise, Amanda's heart rate has nearly doubled from her resting heart rate because her heart would be beating much faster, allowing more blood flow out of her heart at a much faster and frequent rate, resulting to increase cardiac output and stroke volume.
Which of the following increases heart rate?
epinephrine
The major vessels involved in hepatic portal circulation are the inferior and superior mesenteric arteries, the splenic artery, and the left gastric artery
false
During ventricular systole, blood is ejected from the ventricles through the large arteries connected to the heart
true
