The Circulatory System Flashcards
REVISE TABLE 8.1 WITH TYPES OF WBCs
three principal fluids of body
- blood
- tissue fluid
- lymph
pH of blood
7.3 to 7.45
main functions of blood
- transport
- protection
transport by blood
- digested food
- oxygen
- carbon dioxide
- excretory material
- distribution of hormones
- distribution of heat
protection by blood
- forms a clot when there is a cut in blood vessels
- WBCs engulf bacteria which may have entered the body
- produces antitoxins and antibodies
components of plasma
water
proteins
inorganic salts
others- glucose, amino acids, fibrinogen, hormones, urea
inorganic salts in plasma
sodium chloride, sodium bicarbonate
where are RBCs produced
ribs, breast bone, ilium of hip girdle
where are RBCs produced in embryo
liver and spleen
RBCs are deficient of
- nucleus- to accommodate more oxygen
- mitochondria- cannot use oxygen for themselves , and glucose
- endoplasmic reticulum- increased flexibility for movement through narrow capillaries
Polycythaemia
abnormally increased number of RBCs
Erythropenia
abnormally decreased number of RBCs
define diapedesis
squeezing of RBCs through capillary walls and into tissues
where are WBCs produced
red bone marrow, lymph nodes, liver and spleen
define Leukemia
cancer of the tissue forming WBCs who number increases at the cost of RBCs.
Leukopenia
abnormal decrease in WBCs
functions of WBCs
- phagocytosis
- inflammation
- formation of antibodies
define phagocytosis
neutrophiles engulf particle-like solid substances, especially bacteria
define pus
mainly composed of dead white blood cells together with the tissue cells destroyed by the bacteria
formation of platelets
some giant cells called megakaryocytes in the red bone marrow
destroyed in the spleen
location of spleen
in the abdomen
chemical that initiates clotting of blood (COAGULATION)
thrombokinase
which vitamin is essential for prothrombin
vit K (fat-soluble)
define antigens
RBCs have special proteins on their surface called antigens. plasma contains antibodies, with respect to the antigen present.
location of the heart
in the centre between two lungs, above the diaphragm