It is to dilate the pupil, that the reason why mydriatic drops
are given to the patient before examination.
A slit lamp examination includes
viewing the lens and anterior chamber, in bright light the muscle of the iris
contract, reducing the size of the pupil in order to keep more light from going
inside the eye the process is called miosis.
Answer:
Low pH
Explanation:
The skin has sebaceous glands that secrete sebum. Sebum makes a protective layer over the surface of the skin and imparts it an acidic pH due to the presence of fatty acids in it.
Mostly, the pH level of skin is maintained within the range of 3-5 (acidic) which in turn serves as one of the barriers against pathogen provided by skin. Likewise, sweat glands of skin secrete sweat which also imparts the acidic pH to the skin to prevent any infection.
Answer: 1. Lipophobic
2.Thyroid
3.lipophilic
Explanation:
Chemical messengers can be classified by their chemical characteristics including their solubility in water and their chemical structure.
Depending on their solubility in water they can be classified in two groups:
- Hydrophobic (lipophilic) - Molecules are lipid soluble and can easily cross the plasma membrane.
- Hydrophilic (lipophobic) - Molecules that are water soluble and do not readily cross the plasma membrane.
Depending on the chemical structure
Amino Acids are lipophobic.
Amines are derived from amino acids and contain an amine group (-NH2, known as the amino group). An important group of these are the catecholamines which contain a 6 carbon ring (catechol) and are derived from tyrosine. These include dopamine, norepinephrine and epinephrine. The thyroid hormone is derived from tyrosine. All except thyroid hormones are hydrophilic. The thyroid hormone is lipophilic (hidrophobic)
1. Enzyme is the molecule that serves to make reactions work. Enzymes are biochemical catalysts that catalyses chemical reactions in a cell by acting on substrates and convert them to products. Their rate of action increases with increase in substrate concentration, reaching optimum when all active sites of the enzyme are engaged.
2. Plastid are the tiny sacs in the cell that may contain starch. Plastid are major cell organelles found in the cells of plants and algae. Plastids are site for the manufacture and storage of important chemical compounds used by the cell. They often contain pigments used in photosynthesis, and the types of pigments present can change or determine cells color.
3. Lysosome are packets within the cell that contain digestive enzymes. Lysosomes are one of many organelles found in animal cells. they are tiny like sacs filled with enzymes that enables the cell to process nutrients. They contain digestive enzymes which helps in the digestion of worn out organelles, food particles and engulfed viruses or bacteria.
4. Mitochondrion is a structure within a cell that is responsible for production of energy. Energy in a cell is produced through a process of cellular respiration which involves use of nutrients with oxygen gas to yield energy inform of ATP, water and carbon dioxide. The process takes place in the mitochondrion where oxygen acts as proton acceptor in the electron transport chain coupled by production of energy.
5. An Organelle is a small structure that serves specialized functions. A cell is made up of various organelles that help it perform its functions. Each organelle is specialized to perform as specific function different from other organelles, for example ribosomes is an organelle involved in the manufacture of proteins.
6. Golgi apparatus are group of flattened sacs that package and export materials out of the cell. Golgi apparatus also called golgi complex or golgi body, is a membrane bound organelle in eukaryotic cells that is made up by a series of flattened, stacked pouches called cisternae. They are responsible for transporting, modifying, and packaging proteins and lipids into vesicles.
7. Vesicles are tiny sacs connected to the Endoplasmic reticulum and Golgi apparatus. Vesicles are small structures within a cell, or extracellular, consisting of fluid enclosed by a lipid bi-layer. they form naturally during the process of secretion (exocytosis), uptake (endocytosis) and transport of materials within the cytoplasm.
