Carbon monoxide along with oxygen a person feel suffocated because a) carbon monoxide reacts with oxygen b)lungs are are affected by carbon dioxide c)haemoglobin combines more rapidly with carbon monoxide than oxygen

Classified in Biology

Written at on English with a size of 3.32 KB.

The heart: is the pump which circulates d blood, has d size of d person's fist. It is located in d chest, slightly left of centre. Myocardium: are d muscular walls. The heartbeat: refers to d rhythmic sounds that d heart makes as it pumps d blood. It can also be observed by d arterial pulse. Dleft and d right halves of d heart function as synchronised pumps, pumping at d same time, cardiac cycle: 1. atrial contraction (systole): d atria contract, forcing d blood into d their respectve ventricle. 2. Ventricular contraction (systole): d blood in d ventricles is ejected from d heart through d arteries, causing d semilunar valves open. Dblood cannot flow backwards as d atrioventricular valves are closed. D closure of these valves creates d first sound of d heartbeat. 3. Diastole (relaxation): D muscular walls of d heart relax. D pumonary and aortic valves close, generating d second sound of d heartbeat. This prevents d blood that has just been pumped into d arteries from flowing back into d ventricles. Finally, during this step, d atria fill with blood from d vein. Atrioventricular valves: These valves link each atrium with d ventricle directly beneath it, on d same side of d heart. These valves open during atrial contraction as d blood flows from d atrium to d ventricle and then close during ventricle contraction to prevent d blood from flowing backwards. Semilunar valves: These valves link each ventrio its corresponding artery, and are known as d pulmonary valve and d aortic valve. During ventricular contraction these valves open, allowing blood to flow out of d heart and into d arteries, but they close when d heart relaxes to prevent blood from flowing back into d heart. The flow of blood within d body: Pulmonary loop: Blood exits d heart from d right ventricle and travels to d lungs through d pulmonary arteries. Gas exchange:d blood pick up oxygen and releases carbon dioxide. D blood returns to d heart through d pulmonary veins, entering d heart at d left atrium. Systemic loop: blood in d left ventricle is pumped out of d heart through d aorta, which leads to all of d body's organs. D arteries branch into smaller vessels, eventually reaching capillaries, within particular tissues. While moving through d capillaries, oxygen and nutrients move from d blood into d surrounding cells while waste molecules move into d blood. Without these nutrients and oxygen, cells are unable to function.  **

Entradas relacionadas: