Answer:
Troponin and calcium ions.
Explanation:
Troponin is a component of thin filament along with tropomyosin and actin. It is a protein complex to which calcium binds and start the production of muscular force.
Calcium also playing a very important role in muscle contractions, it binds with troponin and helping to move tropomyosin.
When calcium ion attached to troponin, then conformational changes occurs in troponin shape and moves which allow tropomyosin going away from its inhibitory position from the myosin-binding sites on actin. After this, the energized myosin head starts binding to the actin molecules and starts the cross bridge cycle, which helping in shortening the muscle's fiber.
Cells are the most simple level of organization, as tissues contain cells, organs contain tissues and systems contain organs, so R would be your answer.
Water travels from roots to leaves, where it is used for photosynthesis.
Answer:
Stop the infusion.
Explanation:
The blood transfusion can cause sometimes problem to the patient in case when the mismatched blood is given in the patient's body. Sometimes the patient body is unable to uptake the foreign blood.
As the information in the question, the RN must stop the infusion. Urticaria represents the allergy in the blood plasma protein or the immune cell reaction in the body. The infusion is prevented as this might cause the destruction of immune cells in the body.
Thus, the answer is stop the infusion.
The answer is mitochondria because mitochondria is involved in cellular respiration.
