BIO120H1 Study Guide - Midterm Guide: Ethylene, Thigmotropism, Tracheid
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BIO120H1 Full Course Notes
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Document Summary
Transports gases, nutrient molecules to tissues and chemical messages from body part to body part. Made up of the heart, blood vessels and blood. Surrounded by pericardium (protective sac), allows heart to expand and contract. Formed from myocardium, specialized muscle tissue (heart cells) Made of 4 chambers: atria and ventricles. Considered double pump, divided by interventricular septum. Right heart: pumps deoxygenated blood to lungs (pulmonary circulation) Left heart: pumps oxygenated blood to body (systemic circulation: papillary muscles: muscular extensions of ventricle walls attached to valves, chordae tendinae: strong specialized tissue that attach valves to papillary muscles. Heart electrical conduction system: the heart depolarizes (ionic exchange between + and to send messages. Sinoatrial node is the natural pacemaker of the heart. The electrical signal spreads through both atria via the internodal pathways, causing them to contract and forcing blood into ventricles.
