Capillaries:these are microscopic blood vessels located in all the organism’s tissues.Capillaries are formed by walls that only have one layer of cells.This all
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What are the two movements of the heart?
Systole and diastole.
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Why does blood have a low speed when it reaches the cells?
Because blood give them nutrients and oxygen,and blood take them waste substances from cells.
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What two things does the environment provide for cells?
Matter and energy
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What are the lymphatic organs?And their functions?
Spleen,thymus and bones marrow(médula ósea). Function:to produce white blood cells.
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Why our circulation is closed?
Because blood is always inside the blood vessels (vasos sanguíneos).
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What is the internal environment?
It’s all the substances that are out of the cells,so they form part of the interstitial plasma.
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Blood plasma:
Blood plasma: made up of water with minerals(90%),nutrients(glucose,amino acids, vitamins…),waste products(urea,uric acid,CO2),proteins and dissolved hormones.
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What is the cardiac output?
It’s the volume of blood the heart pumps in one minute.
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Blood cells:
Blood cells:the three types of blood cells are erythrocytes,leukocytes and thrombocytes.
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What occurs in each one?
Sístole.Contracción.Las aurículas se contraen e impulsan sangre a los ventrículos que están relajados. Diástole.Relajación.Las aurículas se relajan y los ventrí
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What is the heart rate?
The heart rate is the number of times the heart beats per unit of time.The heart beats approximately 70 times per minute.
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Arteries:
Arteries:these carry blood from the heart to other organs.They have wide muscular walls and are elastic.
