Answer: The correct answer is-
C. Insulin secretion in response to high blood sugar.
D. Increased heart rate in response to exercise.
F. Proton pumping to maintain a proper pH level.
Homeostasis can be described as a tendency of living organisms to maintain a state of stable internal environment. In other words, it is the tendency to resist any change in the optimal conditions for survival.
It is brought by several regulatory mechanisms in the body such as regulation of body temperature, regulation of pH, regulation of osmolarity etc.
- Whenever there is high blood sugar level, insulin hormone is secreted from pancreas that reduces the blood sugar level.
- Heart rate is increased in response to exercise so that more oxygen is transported through blood circulation and more amount of energy is harvested through cellular respiration in the form of ATP ( required in exercise).
- Pumping of proton maintains a proper pH level ( such as in lysosomes, where pH is highly acidic, high proton concentration is regulated through proton pumping).
Thus, option C), D), and F) are the examples of feedback mechanisms that help in maintaining homeostasis.
The answer is B because if there is variation there would be certain bacteria with a favorable trait to survive when the antibiotic is released.
Answer:
Around 30 trillion cells!
Explanation:
False. Four more things can be dissolved in sulfuric acid than in water.
Answer:
The nervous system together with the endocrine system enables the organism to perceive the variations of the (internal and external) to disseminate modifications that these variations produce and execute the answers appropriate to maintain the internal body balance (homeostasis). The autonomic nervous system divides into the sympathetic nervous system and parasympathetic nervous system. In general, these two systems have opposite (antagonistic) functions, they correct the excesses of the other.
For example, if the sympathetic system speeds up too much the heartbeat, the parasympathetic system kicks in, slowing down the heart rate. If the sympathetic system speeds up stomach work and intestines, the parasympathetic comes into action to reduce the contractions of these organs. The sympathetic generally stimulate actions that mobilize energy, allowing the body to respond to stressful situations. For example, the sympathetic system is responsible for the acceleration of heart rate, by increasing the blood pressure, the concentration of blood sugar and by activating the general metabolism of the body. On the other hand, parasympathetic mainly stimulates relaxing activities, such as reductions in the heart rate pace and blood pressure. One of the main differences between the sympathetic nerves and parasympathetic is that the postganglionic fibers of the two systems usually secrete different hormones.