Presentation on theme: "RED ALERT! The Circulatory System and the Blood. Blood Blood is a heterogeneous mixture. It is a COLLOID, and has four main components 1.Red corpuscles."— Presentation transcript:
RED ALERT! The Circulatory System and the Blood
Blood Blood is a heterogeneous mixture. It is a COLLOID, and has four main components 1.Red corpuscles (red blood cells) 1.White corpuscles (white blood cells) 2.Plasma (fluid) 3.Platelets
Red Blood Cells Carry Oxygen and Carbon Dioxide with the help of Hemoglobin They are produced in the bone marrow They live only 3-4 months and have no nucleus
Blood Types Red blood cells will have proteins which stick out. They are called Antigens The opposite of antigens are Antibodies If an antigen meets its antibody, they clump and form clots, which are BAD!!
ABO Blood Types Blood Type Antigen on red blood cell Antibody in Plasma AAAnti-B BBAnti-A AB A & B None ONone Anti-A & Anti-B
Rh antigen: Rhesus System Blood, of all types, can also have an Rh antigen on them and there is an antibody for it. If a person has this antigen, they will have a + next to their blood type (ex: A+ means they have the A and Rh antigen) If a person does not have this antigen, they will have a – next to their blood type (ex: A- means they only have the A antigen)
Donors & Recipients When you are looking at donors and recipients, you must make sure the antibodies of the recipient do not attack the antigens of the donor ONLY LOOK AT ANTIBODIES OF RECIPIENT AND ANTIGENS OF DONOR!!! The antibodies of the donor are not recognized by the recipients body and are destroyed O- is the universal donor and AB+ is the universal recipient for blood transfusions.
Plasma It carries Nutrients and Hormones (chemical messages) to the cells It carries Urea and Carbon dioxide away from the cells. Plasma suspends red and white blood cells so they can flow through the body. It also has: - clotting factor - antibodies and - carries off solid waste.
Platelets Smaller than red blood cells Responsible for clotting Link together to form scabs when in contact with air. White blood cells They are the main defense against disease. No hemoglobin Can pass through capillary walls.
White blood cells White blood cells kill bacteria and viruses through: 1)Phagocytosis – eating them with help from antibodies 2) Antibodies – Latch onto bacteria/viruses
Pathogens Pathogens are viruses and bacteria. VirusBacteria Smallest pathogen Invade cells Few drugs to fight them To kill the virus, you must kill the cell Single cell organisms Reproduce quickly Produce toxins which destroy cells Can be killed with antibiotics
The Circulatory System The Circulatory System is the major transportation system in the body. Pulmonary circulation carries blood that contains carbon dioxide TO THE LUNGS, where it gets rid of the waste and is resupplied with oxygen Systemic circulation carries the oxygenated blood to cells in the body and supplies them with nutrients as well.
Purpose It serves to: 1)transport food and oxygen to the body, 2) Pick up waste produced for removal from the body, 3) Help regulate body temperature.
The Heart This is the motor (pump) that makes the system work.
Inside the Heart The Heart is made up of muscle tissue and has four main chambers 1.The right atrium 2.The right ventricle 3.The left atrium 4.And the left ventricle The heart also has valves to prevent backflow of blood
The Human Highways The highways and roads of the body are collectively, they are called blood vessels. They are: 1)Arteries 2)Veins 3) Capillaries.
Arteries Arteries take blood away from the heart. Arterioles are smaller arteries. They have thick walls and contain a layer of muscle. Blood pumped from the heart is under high pressure, so it produces small bulges along the artery.
Veins They carry blood to the heart. Venules are smaller veins They have a thinner muscular layer with lower blood pressure. Surrounding muscles help blood to flow though veins They also contain backflow valves.
Capillaries Link Arterioles to Venules Have thin walls so gas exchange can happen.
Blood Circulation Right Atrium Right Ventricle Pulmonary Artery Arterioles Pulmonary capillaries blood gets oxygenated Venules Pulmonary Veins Left Atrium Left Ventricle Left ventricle Aorta Arterioles BODYs capillaries Venules/Veins Vena Cavae (superior or inferior) Right atrium
The walls of the left ventricle are thicker (more muscular) than those of the right ventricle because the left ventricle has to push blood into the entire body, whereas the right ventricle only has to push blood as far as the lungs. BLOOD ALWAYS LEAVES THE VENTRICLES, GOES THROUGH THE BODY, AND COMES BACK INTO THE ATRIUMS!!
Blood Pressure Blood Pressure has two types, Systolic and Diastolic. Systolic pressure is measured when pressure exerted by blood on artery walls is at its maximum (when the ventricles in the heart contact) Diastolic pressure is measured when pressure exerted by blood on artery walls is at its minimum (when ventricles are not contracting) Blood pressure = systolic pressure (bigger #) diastolic pressure (smaller #)
REVIEW: Pressure Mathematically, Pressure (symbol: p') is the force per unit area applied on a surface. p = F A F= Force A= Area The units are N/m 2 or Pa or mm of Hg
REVIEW: What is pressure? Pressure is the result of molecules or atoms bouncing off each other and the surfaces that hold the fluid in. So what happens to pressure if we increase temperature? Hint: IT INCREASES!!
So….. What happens to pressure if: –You have a lot of force acting on a small area? High Pressure –Same force but over a larger area? Lower Pressure –Lower force acting on a huge area? Very Low Pressure
Area Formula What general shape do you think our blood vessels are? They are Cylinders! Arteries have a bigger surface area so that they can withstand high force of heart on blood and pressure will be lower
Compressible/Non-compressible Fluids In general fluids (gases and liquids) fit into two categories. Compressible: With increased pressure, the volume and temperature will change (decrease). Non-compressible: With increased pressure the volume and temperature will NOT change (decrease). Blood is a non-compressible fluid
Fluids move from high pressure to low pressure area. What if the fluid can not pass? The blood vessel will burst!
Heart Health If blood pressure is to high, you have Hypertension, to low, Hypotension. Hypertension is usually cause by a narrowing of blood vessels due to cholesterol build up.