170 likes | 305 Views
The Circulatory System. Plan of attack. What is the Circulatory System What does it do Components Blood Blood Vessels Heart Putting it all together . What is the circulatory system?. Network of vessels used as a transportation system in the body with 6 major functions :
E N D
Plan of attack • What is the Circulatory System • What does it do • Components • Blood • Blood Vessels • Heart • Putting it all together
What is the circulatory system? • Network of vessels used as a transportation system in the body with 6 major functions : • Transports : • Nutrients • Waste • Chemical messages • Plays a role in combating and infection • Provides a liquid environment for cells • Helps regulate the body’s pH level • Clotting to prevent loss of body fluids • Helps maintain a stable internal body temperature
What makes up our circulatory system? • Blood • Blood Vessels • Heart • *Lungs
Open circulatory system vs. Closed circulatory system • There are 2 kinds of circulatory systems : • The open circulatory system is primarily found in snails, insects and crustaceans • The closed circulatory system is commonly found in earthworms, squids, octopuses, and vertebrates
Open Circulatory System • Has a heart (or multiple) but does not have a complete network of blood vessels • Blood is pumped to body cavities where it supplies the cells with oxygen and nutrients directly • The heart contractions pump the blood from one body cavity to the next, and when the heart relaxes blood is drawn back to the heart through pores
Closed Circulatory System • This type of circulatory system has a closed network of blood vessels • Large blood vessels break off into smaller blood vessels to supply oxygen and nutrient carrying blood to all of the body tissues
Functions of Blood • Blood has six major functions : • Transporting materials (oxygen, nutrients, waste) • Help maintain internal temperature (homeostasis) • Providing a watery environment for cells • Combating disease and infection • Regulate body’s pH levels • Clotting to prevent los of body fluids
Components of Blood • Red Blood Cells or Erythrocytes (45%) • White Blood Cells or Leukocytes (less than 1%) • Platelets (smallest component of blood – less than White Blood Cells) • Plasma (55%)
What is blood made of? • Red Blood Cells or Erythrocytes • Primary function is to transport oxygen • Transport of oxygen is aided by hemoglobin • Oxyhemoglobin complex give blood its red colour, when oxygen is given up, the shape of the Red Blood Cell changes causing a reflection of blue light, this is why our veins appear blue • Red Blood Cells do not have a nucleus, which causes them to have a concave centre
What is blood made of? • White Blood Cells, or Leukocytes • There are two types of leukocytes • Agranulocytes and granulocytes • White Blood Cells called Macrophages use Phagocytosis to destroy invading microbes • White Blood Cells do contain a nucleus, which makes them distinguishable from Red Blood Cells, and Platelets • Allergies
What is blood made of? • Platelets • Are responsible for initiating blood clotting • Do not contain a nucleus – like Red Blood Cells • Look like 2 plates stacked together
What is blood made of? • Plasma • Provides a liquid environment for the components of blood • Transports hormones • Transports vitamins and cholesterol
Leukocytes WBCs Made in the bone marrow and lymph system Contains nucleus Part of the immune system Combats foreign cells by phagocytosis 10% minerals, vitamins, hormones, proteins, nutrients, antibodies, salt, oxygen, carbon dioxide, urea, uric acid and ammonia Water 90% Ratio of RBC:WBC 1000:1 Blood Plasma (55%) the liquid part of blood Cells (45%) Erythrocytes (RBC) Made in the bone marrow No nucleus Contain haemoglobin which transports oxygen Old RBCs are filtered and destroyed by the spleen. Platelets – involved in blood clotting
Blood Bag • Cells = 45% • RBC’s represented by the marshmallows • WBC’s represented by the cotton balls • Platelets represented by the split peas • Plasma = 55% represented by the air in the bag
Textbook Work • Page 245-246 • 7.2 Components of blood • Pg. 246 – Understanding concepts • Page 242-243 • 7.1 The important of the Circulatory system • Pg. 243 – Understanding Concepts