Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blo
od to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth. When we do
not have enough dietary.calcium, calcium can be removed from the bone where it is stored. Examine the model. Select ALL of the
actions that occur when calcium levels are too low.
A)
Osteoclast activity is inhibited.
B)
Eliminate
Parathyroid glands release parathyroid hormone (PTH).
C)
PTH causes osteoclasts to release of Ca** from bones.
D)
Calcitonin is released by the thyroid gland, increasing blood calcium.
E)
Calcium is reabsorbed by the kidneys and small intestines rather than
being excreted
From Molecules to Organisms Structures and Processes
Regale Scientific Gals
Son our
Energy can pass from one trophic level to the next when organic molecules from an organism's body are eaten by another organism. ... On average, only about 10% of the energy stored as biomass in one trophic level—e.g., primary producers—gets stored as biomass in the next trophic level—e.g., primary consumers
A motor converts electrical energy into mechanical energy. Think of a car, it burns fuel (electrical energy) and turns it into tire spinning (mechanical energy)
B. có nhiều hệ sinh thái khác nhau trên trái đất. mỗi hệ sinh thái có một đặc tính riêng và chúng có thể kết nối, tác động qua lại với các hệ sinh thái khác
