Heart: EKG, sounds, structure, function

This takes blood away from the heart? 

• Artery 
• Vein 
• Blood vessel 
• None of these

What is the outer layer of the heart called?

• Heart wall
• Pericardium
• Epicardium
• Thoracic cavity

The pericardium does not provide ___________.

• protection

• an anchor to heart to other structures

• lubrication to reduce friction

• assistance in ventricle contraction

Which layer of the heart wall is composed cardiac muscle fibers which allow the heart to contract?

• Epicardium
• Myocardium
• a.  Endocardium
• a.  None of these

The tiny white cords that anchor the cusps or flaps of endocardium to the walls of the ventricles are called the ____.

• chordae tendineae

• ligamentum arteriosum

• ductus venosus

• myocardium

What is the function of the papillary muscles in the heart?

• Make up muscular wall of heart

• Contract ventricles for pumping blood

• Control opening and closing of AV valves

• Control opening and closing of semilunar valves

The function of chordae tendineae (heart strings) is _____________.

• assist in ventricle contraction

• holding the atrioventricular valves in place while the heart is pumping blood.

• move blood to the lungs

• reoxygenate blood

Which structure is responsible for carrying conduction signals to papillary muscles of the heart and preventing over overdistention (stretching) of ventricles?

• Ligamentum arteriosum

• Moderator band

• AV valves

• Myocardium

Hypertension is ____________.

• high blood pressure
• low blood pressure
• fast heart rate
• low heart rate

Tags

NGSS.HS-LS1-3

Heart sounds "lub" and dub" are caused by 

• valves closing
• muscles slamming into each other 
• valves opening
• blood pressure