{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter_13_Cardiovascular_System

Chapter_13_Cardiovascular_System - Chapter 13...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 13 Cardiovascular System Functions of the Circulatory System • Transportation: ensure adequate blood flow through the capillaries to the various organs*** – Respiratory: • Transport . – Nutritive : • Carry absorbed digestion products. – Excretory : • Carry metabolic wastes to. • Regulation: • Hormonal: • Carry hormones to target tissues to produce their effects. • Temperature: • Protection: – Clotting: • Prevents blood loss. – Immune: • Leukocytes (antibodies and T cells), cytokines and complement fixation protect against pathogens. The Heart KNOW FIG 13.1 • Four chambers • 2 Atria • 2 Ventricles • Septum • Interatrial • Interventricular • Base • Apex Series Flow Through the Cardiovascular System • Pulmonary circuit • Supplied • Blood vessels from heart to lungs and lungs to heart • Systemic circuit • Supplied • Blood vessels from heart to systemic tissues and tissues to heart Oxygenation of Blood • Pulmonary capillaries • Blood entering lungs = • Blood leaving lungs = • Systemic capillaries • Blood entering tissues = • Oxygen diffuses • Blood leaving tissues = Path of Blood Flow Through the Cardiovascular System Location of the Heart Clinical Aspect: Pericarditis inflammation of pericardium Cardiac Muscle – Aerobic muscle – No – – 99% – 1% Hypertrophic Cardiomyopathy • Genetic: 1:500 involves error in muscle proteins • • • • • Leading cause of sudden death in young athletes Heartbeat • Wave of contraction through cardiac muscle • Atria contract • Ventricles contract • Atrial contraction precedes ventricle contraction • Valves prevent backward flow Heart Valves • Atrioventricular valves = AV valves • Right AV valve = tricuspid valve • Left AV valve = bicuspid valve = mitral valve • Papillary muscles and chordae tendinae • Semilunar valves • Aortic Valve • Pulmonary Valve Heart Murmurs • Abnormal heart sounds produced by abnormal patterns of blood flow in the heart. • Defective heart valves: • Mitral stenosis : • Mitral valve becomes. Heart Murmurs • Incompetent valves: • Valves do not close properly. Septal defects: • Holes in septum of the heart. • Blood passes from left to right. • Foramen ovale: Patent Ductus Arteriosus Autorhythmic cells (don’t memorize firing rates) Fastest depolarizing cells: Fastest cells = Conduction System fig 13.10 • Pacemaker cells • Spontaneously depolarizing membrane potentials to generate action potentials • Coordinate and provide rhythm to heartbeat • Sino-atrial node • Atrioventricular node • Conduction fibers • Rapidly conduct action potentials initiated by • Conduction velocity = • Ordinary muscle fibers, • Bundle of His • Purkinje fibers Spread of Excitation Between Cells fig 13.11 • Atria contract first followed by ventricles • Coordination due to presence of gap junctions and conduction pathways • Intercalated disks • Junctions between...
View Full Document

{[ snackBarMessage ]}

Page1 / 10

Chapter_13_Cardiovascular_System - Chapter 13...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon bookmark
Ask a homework question - tutors are online