Heart Physiology

True or False: Your heart needs a signal from your brain in order for it to keep its normal rhythm.

• True

• False

Tags

NGSS.HS-LS1-3

Which of the following shows the correct order of the cardiac conduction system (as seen in graph)?

• 1. Repolarization, 2. pacemaker potential, 3. depolarization

• 1. Pacemaker potential, 2. depolarization, 3. repolarization

• 1. Pacemaker potential, 2. repolarization, 3. depolarization

• 1. Depolarization, 2. repolarization, 3. pacemaker potential

Tags

NGSS.HS-PS3-5

What ion is responsible for pacemaker potential?

• Sodium

• Lithium

• Magnesium

• Potassium

Which of the following is referred to the pacemaker of the heart?

• Sinoatrial (SA) node

• Atrioventricular (AV) node

• Atrioventricular (AV) bundle

• Purkinje fibers

Tags

NGSS.HS-LS1-3

Why do cardiac muscles have a longer, slower sustained contraction compared to skeletal muscles?

• To prevent the heart from beating too slowly

• To prevent the heart from beating too quickly

• To prevent the heart from fatiguing quickly

Which of the following can INCREASE your heart rate?

• Yoga

• Sleep

• Anxiety

• Meditation

Tags

NGSS.HS-LS1-3

What does an ECG or EKG record?

• the electrical changes in the myocardium

• the chemical changes in the medulla oblongata

• the amount of blood filling the ventricles

• the amount of blood filling the atria

What makes the "lub" sound of your heart?

• The aorta sending blood to the rest of your body

• The Superior and Inferior Vena Cava sending blood into the atria

• The SL valves closing

• The AV valves closing