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Objectives wk 5

QuestionAnswer
pericardial cavity potential space b/t the parietal and pericardium and visceral layer. Contains serous fluid
fibrous pericardium most superficial layer of pericardium. Prevents overfilling of the blood
perietal pericardium double walled sac that contains the heart and roots of great vessel.
3. Describe the structure and role of an intercalated disc. two adjacent cardiac muscles are intertwined by gap junctions and desmosomes. This created a direct electrical connection between muscle cells
Characteristics of a cardiac muscle? less SR than skeletal, more mitochondria, short branching cells, T-tubules overlie Z-disc, 1 to 2 nuclei, joined by intercalated discs
5. What are the four chambers of the heart? Describe their location relative to one 1) Right Atrium 2) Left Atrium 3) Right Ventricle-Below R atrium 4) Left Ventricle- below L Atrium
6. What are the four valves of the heart, and where are they located? 1)Tricuspid valve- b/t right atrium and right ventricle 2)Pulmonary valve- Above right ventricle 3)Mirtal Valve- b/t left atrium and leftventricle 4) Aerotic Valve-to left of left ventricle, goes up to the aeorta
8. What is the function of papillary muscles? serve to limit the movements of the mitral and tricuspid valves to fight against inversion. These muscles contract to tighten the chordae tendineae
9.What is an electrocardiogram? Recording of the heart's electrical activity.
11. What is autorythmicity? the natural rhythm. The heart's pacemaker. Continuous firing of heart
12. What extrinsic controls act upon the heart? hormones=adrenaline and autonomic nervous system=stress
13. Describe the importance of calcium in cardiac muscle contraction. The calcium ions result in movement of troponin and tropomyosin on their thin filaments, and this enables the myosin molecule heads to "grab and swivel" their way along the thin filament. Ca+ comes from outside the heart.
Systole contracting of heart driving blood flow.
Diastole when the heart fills with blood after systole contraction
What is the function of chordae tendinae? cord-like tendons that connect the papillary muscles to the tricuspid valve and the mitral valve in the heart
visceral pericardial inner layer of heart tissue. Attach to the organs
epicardium outer layer of the heart tissue
endocardium innermost layer lining the heart chambers
pericardial sac contains the heart and roots of the great vessels
What is the QRS wave? three distinct waves created by the passage of the cardiac electrical impulse through the ventricles and occurs at the beginning of each contraction of the ventricles.
What is the P wave? P- Results from electrical activity in the atria.
What is the T wave? The T-wave represents repolarization of the ventricles.
Characteristics of Skeletal muscle more SR, less mitochondria, lond cylindrical cells, T-tubules overlie A-band, multinuclei, no specialized junctions.
What characteristics do skeletal muscles and cardiac muscles share? contractile unit is sarcomere, composed of thick and thin filaments
What happens in repolarization sodium channels close due to acetocholonase
What does the right and left ventricle do? supply blood to the heart
how do cardiac muscles repair themselves? they cannot
what does the coronary sinus hold? deoxygenated blood
What does the superior and inferior vena cavae do? bring deoxygenated blood to heart. pump it into the right atrium of the heart
What are the three layers of the heart? pericardium, myocardium, endocardium
What is the myocardium? muscle layer of the heart
Where does the visceral layer of the heart attach? to the organs.
What make the cell return to resting potential Na+/K+ pumps
Created by: 1071679203
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