heartt+rich

(1) In which direction does the heart tilt? left (2) What is the approximate size of the heart? the size of your fist (3) Describe the mycoardium. made of muscle tissue and is led to by the cardiac vein and coronary artery. (4) Why do you think a heart attack is sometimes called a mycocardial infarction p. 97? because the msucle of the heart dies due to lack of oxygen to it. (5) Describe the pericardium. its like a sac of tissue that surrounds and protects the heart. (6) Describe the septum. the separating wall in the heart which seperates it into right and left. (7) Where are the atria? Describe their walls. (8) Where are the ventricles? Describe their walls. (9) Where are the atroventricular valves? Describe their shape (number of flaps) and various names. (10) What are the chordae tendinae? (11) Where are the semilunar valves? Why do they have that name? (12) List the path of blood through the heart. (13) Where does blood go when it leaves the right side of the heart? (14) Where does blood go when it leaves the left side of the heart? (15) Which side of the heart is stronger? Why? (16) Why is the heart a double pump? (17) Define systole. (18) Define diastole (19) How many times does the heart normally contract in a minute? (20) What causes the "lub" and "dup" of the heart sounds? (21) What is the sinoatrial node? What does it do? Why is called the pacemaker? (22) What is the atrioventricular bundle? Why is the delay important between the SA node and AV bundle? (23) What does in ECG measure? (24) What triggers the P wave? (25) What triggers the QRS wave?