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What two things does the environment provide for cells?
Matter and energy
What is the internal environment?
It’s all the substances that are out of the cells,so they form part of the interstitial plasma.
Why does interstitial plasma have to be renewed continuously?What elements does this function perform?
Because new nutrients need to be provided and waste products can’t be allowed to accumulate and must be released. The blood.
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.
Blood cells:
Blood cells:the three types of blood cells are erythrocytes,leukocytes and thrombocytes.
What are blood vessels?Name their types.
They are vessels of blood that carry blood around the body. Types:arteries,capillaries,veins.
Arteries:
Arteries:these carry blood from the heart to other organs.They have wide muscular walls and are elastic.
Capillaries:
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
Veins:
carry blood from tissues to the heart.They have thinner walls than arteries.In addition,they have valves that stop blood from going backwards.They are form wher
What is the heart?What is its function?
It’s a hollow muscular organ. Function-To pump the blood.
What is the function of valves?
To avoid that the blood go back.
What is the heartbeat?
It’s a constant movement that heart performs.
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.
What is the cardiac output?
It’s the volume of blood the heart pumps in one minute.
What are the two movements of the heart?
Systole and diastole.
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
