Cardiovascular 2: Physiology

The nodal system is

• the controlling system for voluntary cardiac muscle constriction.

• The unifying control system for the heart beats

• The control system for vasodilation of blood vessels

This is located in the right atrium and is the heart's pacemaker.

• Sinoatrial (SA) node

• Atrioventricular (AV) node

• Atrioventricular (AV) bundle

• Purkinje fibers

________ spread the impulse through the ventricle wall muscles of the heart after the signal is sent through the AV bundle.

• Sinoatrial (SA) node

• Atrioventricular (AV) node

• Purkinje fibers

Rapid heart rate (over 100 bpm)

• Tachycardia

• Bradycardia

Tags

NGSS.HS-LS1-3

Slow heart rate (under 60 bpm)

• Tachycardia

• Bradycardia

Tags

NGSS.HS-LS1-3

Systole = __________

Diastole = ___________

• contraction;

  relaxation

• relaxation;

  contraction

Which order of events is correct for the cardiac cycle?

• 1. Atrial systole

  2. Atrial diastole (filling)

  3. Isovolumetric relaxation

  4. Ventricular Systole (ejection)

  5. Isovolumetric contraction

• 1. Atrial diastole (filling)

  2. Atrial systole

  3. Isovolumetric relaxation

  4. Ventricular Systole (ejection)

  5. Isovolumetric contraction

• 1. Atrial diastole (filling)

  2. Atrial systole

  3. Isovolumetric contraction

  4. Ventricular Systole (ejection)

  5. Isovolumetric relaxation

About ___ mL of blood is pumped out of the left ventricle with each heart beat.

(hint: it is 60% of the body's blood)

• 50

• 60

• 70

• 80

Cardiac Output (CO) formula.

**HR= heart rate & SV= Stroke Volume**

• SV = CO x HR

• CO = HR / SV

• CO = SV / HR

• CO = HR x SV

Factor that modifies heart rate: Sympathetic nervous system speeds up HR & parasympathetic nervous system slows HR

• Neural (ANS) controls

• Hormones and ions

• Physical Factors

Tags

NGSS.HS-LS1-3