Aim: How does blood help us to complete transport throughout our bodies? Do Now: When you scrape your leg blood flows from the wound. hypothesize how you stop bleeding. HW: Castle learning

ARTERY: Highly elastic, muscular tube that expands and contracts. 3 TYPES OF BLOOD VESSELS ARTERY: Highly elastic, muscular tube that expands and contracts. *Carries oxygen rich blood (oxygenated)

VEIN: *Thin, slightly elastic tubes. *Contain valves to 3 TYPES OF BLOOD VESSELS VEIN: *Thin, slightly elastic tubes. *Contain valves to prevent back flow of blood Carries deoxygenated blood to the heart

Capillary: Extremely small tubes (1 cell thick), where materials are 3 TYPES OF BLOOD VESSELS Capillary: Extremely small tubes (1 cell thick), where materials are exchanged by diffusion Capillaries connect arteries to veins Network Of Capillaries artery vein

“Blood is thicker than Water ”

Group of cells (connective tissue) BLOOD Group of cells (connective tissue) Made in bone marrow. Initial blood cells are called stem cells. Functions of blood: Transportation: O2, CO2, nutrients Regulation: fight disease, remove waste, carry hormones, temp., pH Protection: clotting & against disease

Blood Components

Red Blood Cells Platelets White Blood Cells

a fluid, no cells Liquid portion of blood contains: 90% water PLASMA a fluid, no cells Liquid portion of blood contains: 90% water 10% salts

(Erythrocytes) Red Blood Cells 30 trillion in body 120 day lifespan Disk shaped No nucleus Contain Hemoglobin red pigment which helps to carry O2 and CO2 in the presence of Iron

White Blood Cells (Leukocytes) 60 billion in body Colorless Irregular in shape Have 1 or many lobed nuclei (us) Function: Protect against foreign substances create ANTIBODIES

Neutrophil White Blood Cells

Eosinophil Lymphocyte

(Thromboocytes) Platelets 1.5 trillion in body 7 day lifespan Bits of cytoplasm No nucleus Aid in the process of blood clotting to prevent blood loss

45% Plasma: 55% Red Blood Cells White Blood Cells Blood Components Plasma: 55% Red Blood Cells (4.8 – 5.4 million) White Blood Cells (5,000-10,000) Platelets (150,000 –400,000) 45% VIDEO

1) how blood is transported 2) how many times the heart pumps/min. PULSE is the relaxation and expansion of an artery each time the heart pumps. Pulse depends on: 1) how blood is transported 2) how many times the heart pumps/min. (usually 60-80x’s/min.)

Force created by the movement of blood within the blood vessels. BLOOD PRESSURE Force created by the movement of blood within the blood vessels. Systolic pressure= the force of the blood when the heart ventricles CONTRACTS. b) Diastolic pressure= the force of the blood when the heart ventricles is RELAXED.

is measured using a sphygmomanometer Average Normal blood pressure 120/80

List 5 reasons why we can’t live without blood? Summary: List 5 reasons why we can’t live without blood? Transport Clotting Fighting foreign invaders (antigens) Keep body sealed from foreign substances Carries oxygen, carbon dioxide, and nutrients