Chapter 14

Question 1

Pericardium

Answer 1

encases the Heart

Question 2

Atria

Answer 2

thin-walled upper chambers

Question 3

Ventricles

Answer 3

thick-walled lower chambers

Question 4

Chordae tendineae

Answer 4

prevent eversion during ventricular contraction, attached to valve flaps from papillary muscles

Question 5

Tricuspid Valve

Answer 5

Right

Question 6

Bicuspid Valve

Answer 6

Left

Question 7

Semilunar Valve

Answer 7

between ventricles and arteries, aortic valve, pulmonary valve

Question 8

Autorhythmic

Answer 8

Pacemaker cells signal for contraction, set heart rate

Question 9

Action Potential Sequence

Answer 9

1. Na+ channels open
2. Na+ channels close
3. Ca2+ channels open; fast K+ channels close
4. Ca2+ channels close; slow K+ channels open

Question 10

SA node

Answer 10

sets the pace of the heartbeat

Question 11

P Wave

Answer 11

depolarization of the atria

Question 12

QRS

Answer 12

wave of ventricular depolarization, atrial repolarization

Question 13

T Wave

Answer 13

repolarization of the ventricle

Question 14

Tachycardia

Answer 14

Faster than normal

Question 15

Bradycardia

Answer 15

Slower than normal

Question 16

Hypertension

Answer 16

Increased HR

Question 17

Epinephrine

Answer 17

Increased: contractility, SV, EDV, Venous Return, Filling Time
Decreased: ESV, Afteroad

Question 18

Severe Blood Loss

Answer 18

Increased: Contractility, Afterload
Decreased: Venous Return, EDV, ESV