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3 years ago

Many drugs can be applied to the skin without entering the blood. how is this fact explained?

2 answers:

8 0

While the outer layer of the skin acts a physical barrier, the skin is porous. It's the same reason sweat appears on our skin when we're hot.

ra1l [238]3 years ago

7 0

*A drug administered by the cutaneous route can have one of these three actions:

Local action, superficial: ex. local anesthetic ...

Deep action: ex. anti-inflammatory action ...

Systemic or general action: ex. anti-anginal action

*The skin is a very effective barrier, which limits the number of drugs that can enter the system.

*The factor influencing the penetration of the drugs are:

- Nature and physicochemical properties of P.A: Molecular weight, hydrophilicity, lipophilicity, stability ...

- Formulation of the drug: Excipients lipophilic, hydrophilic, amphiphilic, an absorption promoter

- Nature and condition of the skin, Location, age, thickness (1 to 8 mm ...), vascularization...

*To not penetrate the skin, a drug should have to be of high molecular mass (to be unable to penetrate through the skin tissue), hydrophilic (since the skin is of a lipophilic nature).

*For example, solar creams should not enter the system so the excipients used are hydrophilic in nature.

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Proteins are one of the three macronutrients found in the diet and important structural molecule organisms. Proteins help provid

xxTIMURxx [149]

Answer:

The human body is able to synthesize them: proteins, fats

Contains nitrogen in the amine group : proteins

Made according to instructions from DNA: proteins

Explanation:

The cells of the human body synthesize proteins from the transcription and translation processes.

Fats and carbohidrates are ingested in the diet and metabolized by the body. However some types of fat such as cholesterol is synthesized by the human body. Same as phospholipids that are part of the membranes.

Proteins are formed by hydrogen, oxygen, nitrogen and carbon. Amino acids are characterized for owning a carboxyl group (- COOH) and an amino group (-NH2)

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3 years ago

The CNS is vulnerable. There are several systems and structures in place which protect these vital tissues. How is the brain and

V125BC [204]

Answer:

1) Skull and Vertebral column

2) Meninges

3) Cerebrospinal fluid.

Explanation:

Central Nervous system:

CNS is the abbreviation of Central Nervous system. CNS controls the whole body functions so it is the most important component of the body. CNS consist of two parts 1) Brain and 2) Spinal cord

Both of these organs are very important and hence need to be protected. Nature provided these organs with certain protective mechanisms these includes

1) Skull and Vertebral column:

Skull is present around brain and vertebral column is present around spinal cord. These structure provides mechanical support to soft parts of CNS.

2) Meninges:

These are the membranes that provide antiseptic environment to the brain and hence protect it from microbes and other harmful substances.

3) Cerebrospinal fluid:

This fluid is present inside meninges which nourishes the brain and protect it from mechanical stresses.

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3 years ago

A type of tumor in the pancreas called a glucagonoma produces and releases excess glucagon in the blood

Lana71 [14]

A glucagonoma may be a terribly rare tumour of the exocrine gland within which there's a rise in unleash of the internal secretion glucagon, inflicting a characteristic efflorescence and raised glucose levels.due to this the glucose level are going to be exaggerated.Diabetes mellitus kind one, additionally referred to as kind one polygenic disorder, may be a sort of diabetes within which not enough insulin is made.[4] This ends up in high glucose levels within the body.where as in glucagonoma high levels of chromogranin A, that may be a macromolecule typically found in tumor tumors, and anemia, that may be a condition within which you've got a low level of red blood cells.

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3 years ago

The timing in the cell cycle in eukaryotic cells is believed to be controlled by a group of closely related proteins called

arsen [322]

The answer would be cyclins hope it helps

6 0

3 years ago

What is a substance that forms by joining many small molecules together.

kaheart [24]

Answer:

Carbohydrates, proteins, and nucleic acids are built from small molecular units. The small molecular units are called monomers

Explanation:

I'm not really sure if that was what you were looking for, but I remember learning this in biology. I'm sorry if this doesn't help.

6 0

2 years ago