blood Flashcards
1
Q
circulatory system
A
network of blood vessels that supply cells with nutrients and collect waste materials
2
Q
components of circulatory system
A
- blood: transport medium
- blood vessels: transport vessels
- heart: pumping mechanism
3
Q
blood
A
- collection of speialized cells
- connective tissue
- variable blood type and Rh factor
4
Q
functions of blood
A
- circulates vital materials (oxygen/nutrients) to cells
- removes waste products from cell metabolism (CO2)
- equalize temperature by heat to extremeties
- antibodies defend against disease
5
Q
components of blood
A
- plasma
- red blood cells
- white blood cells
- platelets
6
Q
plasma
A
- protein-rich liquid where blood cells/platelets are suspended
- 90% water
7
Q
red blood cells
A
- erythrocytes
- 45% of blood
- bi-concave shaped disc
- no nucleus
- transport O2 and CO2 via hemoglobin
- survive for 120 days
- made with bone marrow (2 million made each second)
8
Q
oxygen-carrying capacity
A
- depends on number of RBCs present and amount of hemoglobin in each RBC
- each RBC has 280 million iron/protein molecules called hemoglobin
- hemoglobin binds oxygen and lets RBC carry it to body
9
Q
white blood cells
A
- leukocytes
- less than 1%
- colourless, have nuclei
- made in bone marrow
- double/triple when fighting infection
- defend against disease and immunity
10
Q
phagocytosis
A
- done by white blood cells
- “cell eating”
- cell binds to item it wants to engulf
11
Q
platelets
A
- thrombocytes
- small, irregular cell fragments
- no nuclei
- breakdown in 7-10 days
- made in bone marrow
- helps w/ blood clotting
12
Q
blood clotting
A
- process begins when blood vessel is damaged
- platelets rush to site
- platelets stick to collagen fibers, producing a temporary clot
- fibrinogen in plasma converts to long strands of fibrin forming mesh that traps more platelets below surface
