Health Sciences 2300A/B Lecture : The Heart (recover).docx

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 2300A/B
• Professor: Jeremy Roth

Document Summary

Cardiac muscle is involuntarily controlled while skeletal muscle is voluntarily controlled. Heart constantly beating, can beat on its own. Will beat forever if supplying sufficient amount of oxygen: controlled by the parasympathetic nervous system (rest and digest), and sympathetic nervous system (fight or flight) The heart is anterior within the thoracic cage. Has an apex (point) that points downwards (bottom left of the chest) The heart sits on top of the diaphragm in a sac called the pericardial sac. Purpose to provide a cavity to reduce friction as the heart beats. Additionally, the sac helps to anchor the heart to the diaphragm sac is anchored to the diaphragm and great vessels. Between t3-t4 lies the top of the heart. At t9 lies the bottom of the heart. If the zyphoid process was to break, it could potentially could puncture the heart. Pulmonary circuit send blood to and from the lungs.