Answer: Most of the hormones released by endocrine system are regulated by negative feedback mechanism.
- Negative feedback mechanism functions to reduce the intensity of original stimulus in order to maintain homeostasis.
Explanation:
When blood calcium levels are decreased, parathyroid gland releases parathyroid hormone (PTH).
PTH acts on bone and stimulate bone resorption by promoting osteoclastic activity. It stimulates reabsorption of calcium in kidneys. PTH promotes calcitriol synthesis that acts on small intestine to increase calcium absorption.
Action of PTH increases blood calcium levels.
When blood calcium levels are increased, thyroid gland releases hormone calcitonin.
Calcitonin opposes PTH and acts to deposit calcium in the bone.
Calcitonin acts on osteoblasts and promote increase in bone mass.
Action of calcitonin decreases blood calcium levels.
Answer:
Atomic radius increases by increasing the atomic number.
Explanation:
Atomic radius
:
Atomic radius is the distance between nucleus of an atom to its outer most electronic shell.
Trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
The given data show that the atomic number in increased from 4 to 88 it means atomic radius also increased from 1.53Å to 2.83Å. It means the given data is the elements of periodic table present in group. It is the data of 2nd group of periodic table.
Answer:
well we do need up to explain the neergyu field on the world you probaly think im spamming but i thing you need up
Explanation:
Nope. Only electrons take part in the "chemical reaction".
But if you collide two particles at the speed of light or close to it, then protons, neutrons and in fact other subatomic particles also take part in the reaction. PS: this is not a chemical reaction, it is called nuclear reaction.
You need to accelerate particles at the ultimate speed because protons and neutrons are strongle held inside nucleus because of "strong force"