Deck 37: The Heart As a Pump

Question 1

Blood is ejected into the systemic circulation during

A) Atr ial d ias tole
B) Atr ial s ysto le
C) Ve ntr icu lar dia sto le
D) Ve ntric ular syst ole
E) The QR S complex

Answer 1

D

Question 2

The SA node

A) D ire ctly e xc ites ve ntr icu lar m us cle
B) Conducts electrical signals from autonomic nerves
C) Lie s in the wa ll of th e le ft a tria
D) Relays electrical signals from autonomic nerves
E) Is the cardiac pacemaker

Answer 2

E

Question 3

C on tra ctio n o f th e le ft ve ntr icle

A) Oc cu rs at t he sam e tim e as con trac tion of th e righ t ve ntric le
B) Occurs imm ediately after the aortic valve opens
C) Occurs imm ediately after the pulmonary valve opens
D) Ejec ts bloo d thro ugh the tricu spid valve in to the aorta
E) Ejec ts bloo d thro ugh the m itral valve into the a orta

Answer 3

A

Question 4

The aortic valve opens

A) W hen right ventricular pressure excee ds aortic pressure
B) At the end of iso vo lum etric c on trac tion of th e left v en tricle
C) W hen left atrial pressure exc eeds left ventricular pressure
D) W hen right atrial pressure e xceed s right ventricular pressure
E) At t he be gin nin g o f at ria l sys tole

Question 5

The fun ction o f the p apillary m usc les is to

A) Hold valves open during ejection
B) Conduct electrical signals across the chamber
C) Push valves shut during ejection
D) Prevent prolapse of valves during ejection
E) Prevent regurgitation through the aortic valve

Question 6

The ejection fraction is

A) End diastolic volume - end systolic volume
B) End systolic volume - end diastolic volume
C) Stroke volume / end systolic volume
D) Stroke volume / end diastolic volume
E) The fra ction o f the c irculato ry volum e tha t is pum ped out o f the h eart e ach m inute

Question 7

The aortic pressure exc eed s the pulm ona ry pres sur e by a fa ctor o f abo ut 5. A cco rding to the Law of LaPlace, you would expect

A) The left ventricle to have a greater wall tension than the right ventricle during contraction
B) Because of its greater thickness, the left ventricle has the same wall tension as the right ve ntr icle
C) Because of its greater thickness, the left ve ntr icle ha s le ss wa ll ten sio n th an the righ t ve ntr icle
D) Because of the different thickness, no conclusion can be made about relative wall tensio n between right and left ventricles
E) T he left ve ntr icle eje cts les s b loo d th an the righ t ve ntr icle

Question 8

Blo od in th e le ft a tria

A) Enters the left ventricle through the tricuspid valve
B) Enters the left ventricle through the mitral valve
C) Enters the left ventricle with no valve
D) Surrounds the papillary muscles
E) Is depleted of oxygen

Question 9

Blood in the vena cavae

A) Enters the right atria through the m itral valve
B) Enters the right atria through the tricuspid valve
C) Enters the right atria with no valve
D) Enters the left atria through the m itral valve
E) Enters the left atria through the tricuspid valve

Question 10

Blood in the left ventricle exits the heart through the

A) Pulm onary valve into the pulm onary artery
B) Pu lm on ar y va lve into the pu lm on ar y ve in
C) Aortic valve into th e aorta
D) Tr icus pid va lve into th e ao rta
E) Mitral valve into the pulm onary artery

Question 11

The he ar t is

A) Bila ter ally s ym m etr ic a nd loc ate d v er tica lly in th e th or ac ic c av ity
B) Th icker on th e left and loca ted ob liquely in the thora x w ith its apex on the left
C) Bilaterally symm etric but located obliquely in the thorax with its apex on the left
D) Thicker on the right and located obliquely in the thorax with its apex on the right
E) Thicker on the left and located obliquely in the thorax with its apex on the right

Question 12

The tough fibrous sac that encases the heart is called the

A) Pericardium
B) Peritoneum
C) Om entum
D) Perimysium
E) Endocardium

Question 13

The ca us e o f th e fir st h ea rt s ou nd is

A) Closure of the m itral valve
B) Closure of the tricuspid valve
C) Closure of both mitral and tricuspid valves
D) Closure of the ao rtic valve
E) Closure of both aortic and pulmonary valves

Question 14

The tricuspid valve closes when

A) The righ t atria co ntrac ts
B) The left atria con tracts
C) The right ven tricle contracts
D) The left ve ntricle c ontra cts
E) The second heart sound o ccurs

Question 15

Diastole is the

A) C los ed op en ing be twe en righ t an d le ft a tria du rin g e m br yog en es is
B) Period of heart relaxation
C) High est p res sur e in the aorta
D) Period of heart contraction
E) Period of blood ejection

Question 16

Isovolumetric contraction of the left ventricle ends

A) At the first heart sound
B) At the second heart sound
C) W hen left ven tricular p ressu re exc eed s ao rtic pres sure
D) At the T wave
E) At the QRS com plex

Question 17

Systole is the

A) C los ed op en ing be twe en righ t an d le ft a tria du rin g e m br yog en es is
B) Period of heart relaxation
C) High est p res sur e in the aorta
D) Period of heart contraction
E) Period of blood ejection

Question 18

The ca us e o f th e s ec on d h ea rt s ou nd is

A) Closure of the m itral valve
B) Closure of the tricuspid valve
C) Closure of both mitral and tricuspid valves
D) Closure of the ao rtic valve
E) Closure of both aortic and pulmonary valves

Question 19

Blo od in th e rig ht v en tric le

A) Exits th e he art into the p ulm on ary artery
B) Ex its th e h ea rt in to th e p ulm on ar y ve in
C) Exits the heart through the m itral valve
D) Exits the heart through the tricuspid valve
E) Ex its the h eart into the a orta

Question 20

According to the Law of LaPlace, generation of higher pressure at a given radius

A) Requires greater wall tension
B) Requires more shortening to lessen r
C) Requ ires less tension but m ore curvature
D) Cannot occur
E) Requires laminar flow

Question 21

In the aorta with a given radius, turbulent flow is more likely when

A) Pressure in the aorta Increases
B) Blood flow Increases
C) Viscosity of the blood Increases
D) Density of the blood decreases
E) Heart rate decreases

Question 22

Turbulent flow in the heart itself is detected by

A) Echocardiography
B) Murmurs detected by auscultation
C) EKG abnorm alities
D) Non-simultaneous first or second heart sounds
E) Regurgitation