circulation

Slide 1

Blood
5 litres in the body -a specific type of tissue consisting of millions of cells in a fluid- jobs: to TRANSPORT SUBSTANCES around the body DEFEND body against infections and disease 
4c3088d5-932e-416c-b6e6-84592cadfed3 (image/jpg)

Slide 2

Plasma
[90%  H2O , 10% mixture - straw colour}Function: transports SOLUBLE SUBSTANCES carries CHEMICAL MESSENGERS (hormones) redistribute HEAT   
4f9affee-b4c6-4003-911c-5cc99649d5e2 (image/jpg)

Slide 3

Platelets
NO NUCLEUS  - fragments of cells made in BONE MARROW [400,000 per Cm3 of blood]CLOTTS blood vessels are usually smooth- when cut they become rough; this causes a chemical to be released. FIBRINOGEN = soluble protein  FIBRIN = insoluble protein             ^           fibrin - MESH where red blood cells and platelets are trapped 
da1ad9c9-92a0-4130-a737-17f75636212d.gif (image/gif)

Slide 4

Red Blood Cells 
[5,000,000 per CM3]Made in RED BONE MARROW live for 4 MONTHS - destroyed in LIVER SPLEEN  red pigment - IRON  no nucleus = Haemoglobin  BICONCAVE shape = increased surface are  Haemoglobin > a Protein > contains Iron = carries O2Haemoglobin + oxygen --------> oxyhaemoglobin CO poisoning Haemoglobin has a GREATER AFFINITY for CO than O2.breathed CO - less O2 binds with haemoglobin - tissues starve - no energy -deathCO = Car exhausts fumes and cigarettes 
c5420963-4692-4670-bcd5-dfe856f1eb1a (image/jpg)

Slide 5

White Blood Cells Pt1
- larger than red bloods cells- fewer of them [ 8,000 per CM3] function  DEFEND against disease causing micro organisms called Pathogens.primary body defences ---> skin & openings secret defensive chemicals e.g.. mucus, HCl 2 types - Phagocytes & lymphocytes
e0771394-3b7b-4645-9f5f-9c9db5fd21bf (image/jpg)

Slide 6

Phagocytes 
- made in RED BONE MARROW - Live for a FEW DAYS  Large & irregular shapes  MULTILOBED NUCLEUS & GRANULATED CYTOPLASM Function: TO DESTROY = Engulf & DIGEST = PHAGOCYTOSIS 
fd0f0672-143d-4502-8527-328af7cc1f54 (image/jpg)

Slide 7

Lymphocytes 
- made in the LYMPHATIC SYSTEM - Live for SEVERAL YEARS SPHERICAL shape & Red Blood Cell size  LARGE NUCLEUS, Small NON-GRANUAL CYTOPLASM  Function:produce ANTIBODIES ANTIBODIES target surface of proteins called ANTIGENS then tell lymphocytes to produce more anitbodies  cause Micro organisms to CLUMP TOGETHER  PROMOTES phagocytosis   prevents Antigens INVADING HOST CELL tagets toxins with ANTI-TOXINS
ed2f6c67-f17d-48ca-9172-92c0a839217f (image/jpg)

Slide 8