It enters and or leaves it through two separate mechanisms. One is the Sodium potassium pump which works as a gatekeeper for sodium and potassium ions that go in and out of the cell. This is active transport. Another way how it enters/leaves cells is with the help of passive ion channels where they can cross without much difficulty.
Answer:
There are two phases of the cardiac cycle: The diastole phase and the systole phase. In the diastole phase, heart ventricles relax and the heart fills with blood. In the systole phase, the ventricles contract and pump blood out of the heart to arteries.
Explanation:
Answer:
Carbon is important because most living creatures on Earth are composed of carbon, according to The State University of New Jersey website. Living things need carbon to grow, live and reproduce. Carbon is vital in forming large, complex and diverse molecules that characterize living matter.
Explanation:
The major difference between the flow of matter and of energy is that the flow of matter occurs in a cyclic manner i.e. it is recycled, however, the flow of energy in an ecosystem is unidirectional which means, it is not recycled. The flow of matter follows the following path
1) Decomposers release nutrients when they break down dead organisms
2) The nutrients are taken up by plants through their roots
3) The nutrients pass to primary consumers when they eat the plants
4) The nutrients pass to higher-level consumers when they eat lower-level consumers
5) When living things die, the cycle repeats
In case of flow of energy, the energy flows through an ecosystem in one direction, from photosynthetic organisms to herbivores to omnivores and carnivores and decomposers, less and less energy becomes available to support life. This loss of usable energy occurs because each energy transfer results in the dissipation of some energy into the environment as heat
