The sinoatrial node (SAN) is also known as the pacemaker of the heart. C. Describe the order the impulse travels in the heart.

In detail describe importance of heart.

D. Arterial Blood Distribution Complete the schematic diagrams of arterial blood distribution in Figure 30.17. Right subclavian Right vertebral Right superficial Right deep 21 Arch of aorta 10 Right 11 middle 12 cerebral 15 Right 16 posterior cerebral Let external carotid Left subclavian Д Left axillary (gives rise to same branches as right axillary, except that arteries are labeled left instead of right) palmar palmar arch arch (a) Arch of aorta; brain and upper limb 18 19 20 Right dorsalis pedis Abdominal aorta Right internal iliac Left common ilac (gives rise to same branches as right common illac, except that arteries are labeled let instead of right)

Identify the parts of a normal ECG pattern, and discuss the significance of this pattern.