Term
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Definition
| movement of molecules along a concentration gradient from an area of higher concentration to lower |
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Term
| how do we exchange nutriets from bloodstream into capilaries |
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Definition
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Term
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Definition
| facilitates the exchange of materials by providing a rapid long distance internal transport system that brings resources close enough to cells for diffusion to occur |
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Term
| two main types of circulatory systems |
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Definition
open - blood is pumped through open-ended vessels and out among the body's cells
closed - blood is confined to vessels and is distinct from interstitial fluids - cardiovascular |
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Term
| why cant humans just rely on diffusion |
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Definition
| diffusion only works for a very short distance |
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Term
| in what order does blood travel through the different types of vessels |
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Definition
| heart -> arteries -> arterioles -> capilaries -> venuloes -> veins -> heart |
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Term
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Definition
cycle that the heart relaxes and contracts
distole - relaxation phase
cistole - contraction phase |
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Term
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Definition
plasma makes up 50% of volume of blood
90% water - 10% is dissolved salts, proteins |
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Term
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Definition
erythrocytes
most numerous type of blood cell
carbohydrate containing molecules - determine blood type
contains hemoglobin - transports oxygen |
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Term
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Definition
leukocytes - fight infections and cancer
larger than rbcs
contain a nuclei, have organelles |
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Term
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Definition
bits of cytoplasm
pinched off from larger cell in bone marrow
clotting |
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Term
| what is the role that the cardiovascular system plays in homeostasis |
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Definition
| circulatory system - exchanging nutrients and waste, helps control the composition of blood by constantly moving it, helps regulate body temp, hormone distribution, protect against foreign invaders |
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Term
| what are the 3 types of blood vessels in order of pressure |
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Definition
| arteries, capiliaries, veins |
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Term
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Definition
| several organs that facilitate gas exchange |
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Term
| what are the 4 types of respiratory organs |
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Definition
1. moist outerskin - worm
2. gills - fish
3. tracheae - insects
4. lungs - vertebrates |
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Term
| 3 phases of gas exchange in humans |
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Definition
1. breathing
2. transport of gases by the circulatory system
3. servicing of cells within the body tissue - O2 is taken from blood, CO2 goes out as a waste product |
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Term
| what part of the respiratory system in order |
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Definition
| nasal cavity, pharynx, larynx, trachea, bronchi, bronchiolies, alveoli |
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