CIRCULATORY AND RESPIRATORY. BLOOD FUNCTION transports nutrients, O 2, CO 2, & waste defends the...
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Transcript of CIRCULATORY AND RESPIRATORY. BLOOD FUNCTION transports nutrients, O 2, CO 2, & waste defends the...
CIRCULATORY AND RESPIRATORY
BLOOD FUNCTION
• transports nutrients, O2, CO2, & waste
• defends the body against disease
COMPONENTS OF BLOOD
1. 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.
MOVEMENT OF BLOOD
Two Circuits (Pathways)1. Pulmonary (deoxygenated)
• right side of heart sends blood to the lungs for gas exchange
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 SYSTEMExternal Function
• 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)