Answer:
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
Explanation:
Answer:
72
Explanation:
I have answered this question on its learning
Answer:
La célula vegetal comparte similitudes con la célula animal. ... No obstante, se diferencian porque la célula vegetal posee una función que le permite realizar la fotosíntesis, proceso químico a través del cual las plantas sintetizan sustancias orgánicas empleando energía lumínica, para después liberar oxígeno
Explanation:
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Answer:
Positive feedback is used to build more contractions.
Explanation:
Positive feedback mechanism in humans is also observed during childbirth which is induced by the pressing of the ovarian wall by the baby.
The pressing sensation is passed to the brain via different nerves, and in response, the brain stimulates the pituitary to produce oxytocin.
Oxytocin is responsible for the contractions of the uterine muscles which cause the movement of the fetus towards the cervix, further increasing the stimulus.
The positive feedback loop continues until the baby is born.