science biology Q1

• cardiovascular system- transport system of the body
• it comprises- blood, heart, and blood vessels
• the system supplies nutrients and to removes waste products from various tissue in the body
• functions of cardio vascular/ circulatory system transport nutrients, hormones, Remove wastes products, gaseous exchange, immunity, blood vessels transport blood, hearts pumps blood through blood vessels
• components of cardiovascular system- blood, heart, blood vessels
• The blood: blood cells and plasma
• blood cells: erythrocytes, leukocytes, thrombocytes
• plasma- is fluid
• heart is a four chambered, hollow, muscular organ
• heart is approximately a size of your fist
• functions of the heart- generating blood pressure, routing blood, heart separates pulmonary and systemic circulation, ensuring one way blood flow, regulating blood supply
• blood vessels- a closed network of tubes, theses includes: arteries, capillaries, veins
• blood vessels- a closed network of tubes
• blood vessels- a closed network of tubes
• arteries- distributing channel
• arteries has a thick walls, elastic fibers, circular smooth muscle
• capillaries- microscopic vessels
• capillaries has a one cell thick and serves the respiratory system
• veins- draining channel
• general structure of veins - tunica intima, tunica media, tunica adventitia
• classifications of blood vessels- conducting vessels, distributing vessels, resistance vessels, exchange vessels, capacitance/ reservoir vessels