CH 19 IH

check all that occur during ventricular systole

- the semilunar valves open to allow blood to flow into the large arteries - the AV valves close to prevent backflow of blood into the atria

Check all the characteristics of cardiac muscle

-cells are short and branching -cells have one or two nuclei in the center of the cell -they are composed of thick and thin filaments -the functional contractile unit is the sacromere

check all of the ways in which the heart chambers are involved in the pulmonary circulation

-oxygenated blood enters left atrium -the right ventricle pumps deoxygenated blood to the lungs -pulmonary veins pass blood into the left atrium whereas pulmonary arteries carry blood away from the right ventricle

match the component of the electrocardiogram to the correct definition

1. P wave -atrial depolarization 2. QRS complex -ventricular depolarization 3. T wave -ventricular repolarization 4. PQ segment -atrial contraction or atrial systole 5. ST segment -ventricular contraction or ventricular systole

put the steps of the cardiac cycle into the correct order, starting with the beginning of the cardiac cycle

1. atrial contraction and ventricle filling 2. isovolumetric contraction 3. ventricular ejection 4. isovolumetric relaxation 5. atrial relaxation and ventricular filling

put the pattern of circulation into the correct order, beginning with the pulmonary circulation.

1. blood leaves the right side of the heart 2. blood enters the pulmonary arteries and travels to the lungs 3. blood enters the pulmonary veins 4. blood enters the left side of the heart 5. blood enters the systemic arteries 6. blood delivers oxygen to the tissues, and then enters the systemic veins

match the heart valve with its description

1. pulmonary semilunar valve -between right ventricle and pulmonary trunk 2. aortic semilunar valve -between left ventricle and ascending aorta 3. bicuspid valve -between left atrium and left ventricle 4. tricuspid valve -between right atrium and right ventricle

place the locations of the heart's conducting system in order, beginning with the location where the heartbeat is initiated

1. sinoatrial (SA) node 2. atrioventricular (AV) node 3. atrioventricular (AV) bundle 4. left and right bundle branches 5. purkinje fibers

put a single word into each sentence to make it correct.

Electric currents in the heart can be detected by means of ____ applied to the skin. -electrodes An instrument called the electrocardiograph ____ these signals and produces a record on a moving paper chart. -amplifies The chart includes three principle deflections above and below the baseline; the P wave, QRS complex, and the ____ wave. -T The P wave is produced when a signal from the SA node spreads through the atria and ____ them. -depolarizes The QRS complex is produced when the signal from the AV node spreads through the ____ myocardium and depolarizes the muscle. -ventricular The T wave is generated by ventricular repolarization immediately before ____. -diastole

place a single word into each sentence to make it correct

When atrial pressure is greater than ventricular pressure, the ____ valves open. -AV When ventricular pressure rises above atrial pressure, the blood in the ventricle pushes the AV valves ____. -closed In the SL valves, when the pressure in the ____ is greater than the pressure in the arteries, the semilunar valves are forced open. -ventricles When ventricular pressure is lower than ____ pressure, arterial blood holds the semilunar valves closed. -arterial

match the type of blood vessel with its function

arteries -carry blood away from the heart veins -carry blood back to the heart

pulmonary arteries carry highly oxygenated blood

false

classify the following images into the phase of the cardiac cycle they represent

ventricluar filling -atria are contracting and AV vavles are open -atria are relaxed and AV valves are open

during the depolarization phase of cardiac muscle

voltage-gated sodium channels open