A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and compose all living things. Most cells have one or more nuclei and other organelles that carry out a variety of tasks.
Answer:
Calcitonin- reduce blood calcium level
Parathyroid hormone- Raise blood calcium level
Explanation:
The thyroid gland is an endocrine gland which secrete its hormone in the blood directly. Both calcitonin and parathyroid hormone are released by the thyroid gland. Parathyroid hormone is released when the blood calcium level is low.
Parathyroid hormone increases the blood calcium level by osteoclast stimulation which releases calcium from bones and increases blood calcium level. Calcitonin is antagonistic to parathyroid hormone and it reduce the blood calcium level in the blood by stimulating the activity of osteoblast.
A chriping bird i would say.
<span>facilitation. This simply means that due to the Earths atmospheric changes, the trees are not likely to be able to spread as they naturally would, facilitation is simply helping that process along so that it occurs as it should.</span>
Human cheek cells are examples of animal cells. Animal cells are eukaryotic and have no cell wall. They lack chloroplasts and cannot photosynthesize.
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