Cardiovascular part 2

systole: ____ diastole:____

• systole: contraction

  diastole: relaxation

• systole: relaxation

  diastole: contraction

Answer explanation

known as the cardiac cycle

"lub" "dub" is associated with what in the heart?

• ventricular contraction

• ventricular contraction and atrial relaxation

• valves opening and closing

• atrial contraction and ventricular relaxation

what type of cardiac cell accounts for 99% of the cells in the heart and is responsible for contracting motions?

• compressing cells

• conducting cells

• contractile cells

• conditioning cells

Answer explanation

two types of cells in the heart: contractile cells (99%) which contract and conducting cells (1%) which conduct electrical impulses

what do pacemaker cells do in the heart?

• they initiate action potentials in the brain to send to the heart

• they send signals to the brain to stimulate heart contractions

• they initiate action potentials without stimulation from the nervous system

• they initiate action potentials with help from the neurotransmitters

Answer explanation

the heart has its own "nervous system" that conducts action potentials with no stimulus

true/false: the heart has its own nervous system so it does not receive signals from the actual nervous system

• false

• true

what component of the heart is responsible for "keeping the pace"?

• the valves

• atrioventricular node (AV node)

• sinoatrial node (SA node)

• the aorta

what is component of the heart is delayed in response so that the atrium and ventricles contract at different times?

• atrioventricular node (AV Node)

• bundles

• also the SA node (sinoatrial node)

• purkinje fibers

which is not a difference between the action potentials in the cardiac system vs the nervous system?

• in the cardiac system there does not need to be a stimulus because it is a constant cycle

• in the cardiac system calcium is used in action potentials instead of sodium

• the cardiac system unlike the nervous system does not rely on action potentials

• in the cardiac system there are no transmitters

what allows the valves to close in the heart?

• ventricular contraction pushes them shut

• pressure

• heart strings

• atria pull them shut

blood moves from _______ to _______ in the heart

• low pressure to high pressure

• high pressure to medium pressure

• high pressure to low pressure

• high pressure to equilibrium