Question

What is one indispensable function of UVB rays in the human body? How does this exert...

What is one indispensable function of UVB rays in the human body? How does this exert evolutionary pressure on human skin color?

Science   Anatomy-And-Physiology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

UVB rays cause sunburn and are responsible for skin cancer and pre-mature ageing. These rays have medium wavelength and affects the top layer of the skin. The main function is melanin production or photoproduction of Vitamin D3. Since UVB directly impairs DNA, there are many evolutionary changes like loss of scalp hair as seen in African population. variation in skin color is also an evolutionary change because people staying close to equator shall have brown pigmentation or black color.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
1) What is the function of pepsin? Where is it found in the human body? 2)...
1) What is the function of pepsin? Where is it found in the human body? 2) Did the addition of pepsin have any effect on salivary amylase’s ability to digest starch? What do you think pepsin does to salivary amylase? Do you think this normally happens in the human body?
what are endocrine disrupter and what are their function in the body how does concentration of...
what are endocrine disrupter and what are their function in the body how does concentration of glucose affect insulin secretion
Why in your opinion the X-rays penetrate the human body and many other things so well...
Why in your opinion the X-rays penetrate the human body and many other things so well and require lead screens to be stopped? Explain using the primitive oscillator model for the dielectric constant.
For the human body, what is the rate of heat transfer by conduction (in kJ/day) through...
For the human body, what is the rate of heat transfer by conduction (in kJ/day) through the body's tissue with the following conditions: the tissue thickness is 2.90 cm, the change in temperature is 2.04°C, and the skin area is 1.35 m2. ________ kJ/day How does this compare with the average heat transfer rate to the body resulting from an energy intake of about 2400 kcal per day? (No exercise is included.) Fraction of (Q/t)conduction and (Q/t)food intake. _____________
What are the functions of glycerophospholipids in the human body? Of triacylglycerides in the human body?
What are the functions of glycerophospholipids in the human body? Of triacylglycerides in the human body?
What would happen to the cell size & cell function of a living human body cell...
What would happen to the cell size & cell function of a living human body cell immersed into a 5.0% NaCl solution and why?
Describe how x-rays are used to generate pictures of the inside of your body.
Describe how x-rays are used to generate pictures of the inside of your body.
Imagine life without one of the four kinds of human body tissue. Choose one. How would...
Imagine life without one of the four kinds of human body tissue. Choose one. How would losing that tissue change your life? What kinds of things would you no longer be able to do?
(a) How high in meters must a column of water be to exert a pressure equal...
(a) How high in meters must a column of water be to exert a pressure equal to that of a 760-mm column of mercury? The density of water is 1.0 g/mL, whereas that of mercury is 13.6 g/mL. (b) What is the pressure in atmospheres on the body of a diver if he is 39 ft below the surface of the water when atmospheric pressure at the surface is 0.95 atm?
The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature...
The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.57 m, a width of 44.0 cm and a length of 23.5 cm. Calculate the power emitted by the human body. Fortunately our environment radiates too. The human body absorbs this radiation with an absorbance of 97.0 percent, so we don't lose our internal energy so quickly. How much power do...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT