PPT-Auricles or Atria 1 2 2 2

2 Sinuartrial aperture SV open into posterior end of auricle by a Sinuartrial aperture Guarded by a pair of membranous valve SV open into dorsal wall of right auricle by a large oval . Physiology . of the Heart. Mechanism and Events of Contraction. 1) Influx of sodium ions from the extracellular fluid into the cells initiates the action potential by opening voltage-regulated sodium channels . Phylum: PLATYHELMINTHES. . VS.. Class . Turbellaria. includes: Planarians . Class . Cestoda. Includes: Tapeworms. Class . Trematoda. Includes: Flukes. II. Body Plan/Structure. Flatworms demonstrate a . The third category of muscle is cardiac muscle, which makes up most of the heart. Like skeletal . muscle, . it is striated. Like smooth muscle, it can propagate action potentials from cell to . cell. There . Rhythm refers to the regularity . or spacing . of the ECG waves. Any variation from the . normal rhythm . and sequence of excitation of the heart is termed . an arrhythmia.. Or simply. Abnormal rhythm of heart is called arrhythmia.. Heart – located in mediastinum within the thoracic cavity. The Pericardium – . membrane surrounding heart. Serous Pericardium . = 1. Parietal - outer layer. 2. Visceral - inner layer (part of . epicardium. The Pericardium – . membrane surrounding heart. Serous Pericardium . = 1. Parietal - outer layer. 2. Visceral - inner layer (part of . epicardium. ). Layers of Heart Wall. Epicardium. – outermost layer. 2 circuits: pulmonary and systemic.. The Transport System. Carries deoxygenated blood from the right side of the heart to the lungs and back to the left side.. Pulmonary Circuit. Left side of the heart pumps oxygenated blood throughout the body’s organs.. Answers . Outline the meaning of the term biomaterial. ? (2 Marks). Biomaterials are substances that can be safely placed in contact with living tissue without the tissue reacting adversely with it or rejecting it.. O Level Biology. M Shah. Today’s lesson. Topic covered: Transport in Humans . Syllabus requirement: . (d)describe the structure and function of the heart in terms of muscular contraction and the working of the valves. Biology 12. Did you know…. Your heart beats about 100,000 times a day. Heart Dissection. Can we find:. Inferior vena cava. Superior vena cava. Right atria. Right ventricle. Tricuspid valve. Pulmonary artery. ASSIGNMENT. : Most Of The Anatomy We Have Already Done In The Lab, So Make Sure To Do The . * of slide 1 through 29. . As I Will Likely Not Take The Time To Review This Material.. *. PARTS OF THE CARDIOVASCULAR SYSTEM. Pacemaker. A specific region of your heart muscle . sets the rate at which your heart contracts. . The pacemaker. . located in the wall of the right atrium. . (SA Node). generates electrical impulses that spread rapidly over the walls of both atria, making them contract. . Pag 8of 8 16 OTHR INORATIN Lieay efeence Ths aey at Sheths ben repre by Cen lu Chmicas ty Ld Reao or ssuFirst ssue Saey Dat het are updtd reunty Plese nure thtyouhvea curentcoy Ths SD umarie a t Located within bony thorax (ribs) and is flanked on each side by lungs. Apex points toward your left hip and rests on your diaphragm. Wall of the Heart. The heart is enclosed by double sac of serous membrane called pericardium.