The Circulatory System and Blood Flashcards
Why are circulatory systems essential in multicellular organisms
To ensure every cell can receive oxygen and nutrients
What does Pulmonary systems mean
System which goes to and from the lungs
What does Systemic systems mean
System which goes to and back from the rest of the body
What are the 3 functions of blood
Transport, temperature and immunity
What are the 4 Compositions of blood
Plasma, RBC, WBC and Platelets
What is the liquid part of the blood called
Plasma
What % of blood does plasma make up
55%
What is plasma made 90% from
Water
What does plasma transport
Dissolved foodstuffs and waste product
What is the function of RBC
To carry oxygen around the body
What do RBC contain to deliver oxygen to tissues
Hemoglobin
What shape do RBC have to increase surface area
Biconcave
Do RBC have a nucleas
NO
What is the function of WBC
To defend the body against pathogens
What are Platelets
Cellular fragments that play a major role in the clotting mechanism
What are the 3 types of blood vessels
Arteries, Veins and capillaries
Where do Arteries carry blood
Away from the heart
What do Arteries posses to help withstand high blood pressure
A thick muscular wall and small lumen
Where do Veins carry blood
Towards the heart
What size Lumen and muscular walls do Veins have
Large Lumen and Thin muscular walls
What do Veins contain to prevent the backflow of blood
Valves
What are capillaries connected to
Veins
What size are capillaries
Thin and very narrow (one cell thick)
Why are capillaries permeable
To allow certain molecules to pass in and out
