Answer:
Intramolecular bonds are the bonds that hold atoms to atoms and make compounds. There are 3 types of intramolecular bonds: covalent, ionic, and metallic. Covalent Bond: a bond in which a pair or pairs of electrons is shared by two atoms.
Explanation: I asked my dad who is a doctor .... I hope this helps!!!
D) Amphibia was considered to be the first to develop lungs
C cells of the thyroid gland secrete calcitonin.
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What does C cells of thyroid gland produce?</h3>
- The thyroid follicle, which is the gland's active component, is encircled by a single layer of epithelial cells, and the lumen is stuffed with colloidal material.
- It includes parafollicular cells, or C cells, which release calcitonin.
- The C-cells of the thyroid gland secrete calcitonin, a 32 amino acid hormone.
- When the concentration of blood calcium has grown over the usual range, the thyroid gland releases the hormone calcitonin, which lowers the level.
- The parafollicular cells, sometimes referred to as the C cells, of the thyroid gland are the principal producers of this polypeptide hormone, which has 32 amino acids.
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Question: The C cells of the thyroid gland secrete
a) TSH.
b) parathormone.
c) thyroxine.
d) triiodothyronine.
e) calcitonin
The large number of areas covered by the chemical energetics can be explained by the different forms in which chemical energy can be released: heat and combustion work, electrical energy in electrochemistry, radiant energy in chemiluminescent systems.
The chemical energy provided by a reaction reflects the energy balance associated with the electronic modifications suffered by the species involved.
From an energy point of view, a chemical reaction between molecules can be schematized in two stages. The first requires a supply of energy and corresponds to the rupture of the bonds of the reactant molecules with release of the atoms which constitute them.
The second releases energy and concerns the creation, by recombination of these atoms, of new bonds entering the structure of the reaction molecules.
As a general rule, the energy released in the second stage is greater than the first. We are talking about exothermic reaction. The difference between these two energies (reaction enthalpy) measures the amount of chemical energy transferred to the external environment.
It is conceivable that this quantity translates, not only the number, but also the strength of the connections involved.
