Circulatory System Biology 138

Circulatory System Overview Parts Blood Vessels Blood Heart Functions carry O2, waste, nutrients, hormones transfers body heat defense

Blood Plasma (55%) Solid (45%) 90% H2O 7% Protein (albumin, antibodies, enzymes, etc. 3% food, waste, buffers, vitamins, salts, hormones, etc. Solid (45%) Erythrocytes Leukocytes Platelets

Erythrocytes Functions O2 made in marrow live 120 days hemoglobin

Spleen Functions Removes old RBC’s (so does liver) stores extra RBC’s

Leukocytes large less numerous nucleated made in marrow 5 types

Types Basophil Neutrophil Eosinophil Monocytes Lymphocytes most numerous Eosinophil Monocytes Lymphocytes B Cells T Cells

Platelets Cell fragments From Bone Marrow Clot Blood Contain blood clotting factors (12) Short-lived

Blood Types A, B, AB, O Rh factor Erythroblastosis fetalis Infant responds to attack on RBC’s by increasing RBC production, and sending out immature RBC’s, which you can see with their nuclei in the picture to the left

Heart (External Anatomy)

Heart (Internal Anatomy)

Blood Flow Through The Heart

Heartbeat Control

Blood Vessels Arteries Arterioles Capillaries Venules Veins

Blood Flow Through Capillaries

Blood Pathways Through The Body Pulmonary to lungs Systemic to body

Lymphatic System collects excess tissue fluid vein like similar to plasma, but no protein vein like no pump – skeletal muscle drains into veins lymph nodes filter fluid