A&P 2 module 3 - Ch 19 Assignment and Assessment

Which part of the brain regulates heart rate?

cardiac accelerator nerves

chemoreceptors

medulla oblongata

vagus nerves

proprioceptors

medulla oblongata

Stimulation of which nerve reduces heart rate?

cardiac accelerator nerve

hypoglossal nerve

medulla oblongata nerve

vagus nerve

phrenic nerve

vagus nerve

Which of the following valves prevents blood from flowing back into the left ventricle?

tricuspid valve

bicuspid valve

pulmonary valve

aortic valve

pulmonary vein

aortic valve

What is the region located from the sternum to the vertebral column between the lungs?

mediastinum

This part of the heart can initiate a contraction and can set a constant heart rate of about 100 beats per minute.

sinoatrial node

The second heart sound represents which of the following events?

valvular stenosis

semilunar valves opening

atrioventricular valves closing

semilunar valves closing

atrioventricular valves opening

semilunar valves closing

This is used to reduce the friction between membranes of the heart.

pericardial (serous) fluid

Which deflection represents repolarization of the ventricle?

R wave

T wave

S wave

P wave

Q wave

T wave

Through which structure does blood pass from the right atrium to the right ventricle?

tricuspid valve

To which side of the body is the apex pointed?

to the left

What is the correct sequence of structures that allows the normal sequence of excitation to progress through the heart?

SA node, AV node, Bundle of His, Bundle branches, Purkinje fibers

The "lubb" sound heard during a heartbeat is actually the sound of the ________ valve closing. [HW]

AV

Which of the following has the fastest natural rhythm? [HW]

the AV node

the SA node

the ventricles

all of these

the SA node

Which of the following consists of inelastic dense irregular connective tissue? [HW]

parietal layer of pericardium

serous pericardium

fibrous pericardium

epicardium

parietal cavity

fibrous pericardium

Which EKG wave corresponds with contraction of the aorta? [HW]

P wave

Which factor would increase stroke volume?

increased preload, decreased afterload, increased contractility

Which of the following marks the boundary between the ventricles? [HW]

coronary sulcus

anterior interventricular sulcus

posterior interventricular sulcus

coronary sulcus and posterior interventricular sulcus

anterior and posterior interventricular sulcus

anterior and posterior interventricular sulcus

Failure of the SA node to depolarize would result in an ECG [HW]

lacking a T wave

lacking a QRS complex

lacking a P wave

that is isoelectric

that is normal

Lacking a P wave

Damage to papillary muscles would

A. prevent the semilunar valves from opening

B. prevent the AV valves from closing

C. allow blood to flow backwards from the arteries into the ventricles

D. allow blood to flow backwards from the ventricles into the atria

E. prevent the AV valves from opening

allow blood to flow backwards from the ventricles into the atria

As each ventricle contracts where does blood move?

into an artery

Which of the following consists of mesothelium and connective tissue? [HW]

epicardium

myocardium

endocardium

pericardial cavity

fibrous pericardium

epicardium