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