Circulatory and respiratory

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Presentation transcript:

Circulatory and respiratory

Blood FUNCTION transports nutrients, O2, CO2, & waste defends the body against disease

Components of blood PLASMA: liquid medium made of 90% water, sugar, salts, amino acids, vitamins, minerals

Components of blood 2. RED BLOOD CELLS (erythrocytes): transport CO2 and O2 gas made of iron-containing hemoglobin (O2 binds here) lack of nucleus leaves space to transport materials

Components of blood 3. WHITE BLOOD CELLS (leukocytes): defend against pathogens

Components of blood 4. PLATELETS: form blood clots

CIRCULATORY SYSTEM Function Moves nutrients and waste throughout the body

STRUCTURES 1. Heart: muscular organ that pumps blood to all parts of the body. Divided into right side and left side by septum Each side has an upper section (atrium) and lower section (ventricle).

Structures, cont. 2. Vessels: smooth muscle surrounded by connective tissue

Structures, cont. 2. Vessels: smooth muscle surrounded by connective tissue arteries – carries blood AWAY from the heart veins –carries blood to the heart

Structures, cont. 2. Vessels: smooth muscle surrounded by connective tissue arteries – carries blood AWAY from the heart veins –carries blood to the heart capillaries –narrow blood vessels that pass blood in single file. Gas exchange occurs here.

Two Circuits (Pathways) MOVEMENT OF BLOOD Two Circuits (Pathways) 1. Pulmonary (deoxygenated) right side of heart sends blood to the lungs for gas exchange

Two Circuits (Pathways) MOVEMENT OF BLOOD Two Circuits (Pathways) 1. Pulmonary (deoxygenated) right side of heart sends blood to the lungs for gas exchange 2. Systemic Circuit (oxygenated) left side of heart sends blood to the body to deliver oxygen and pick up waste

RESPIRATORY SYSTEM External Function Pathway Exchange of gases between atmosphere and blood Pathway mouth/nose  pharynx epiglottis trachea bronchi lungs

MECHANISM Large skeletal muscle (diaphragm) contracts pulling thoracic cavity down causing the lungs to fill with air

INTERNAL FUNCTION Exchange of gases between blood and other body cells Gases diffuse across due to concentration gradients (high to low)

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