This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Explain the function of the lacrimal sac. What will be an ideal ... (Read 46 times)

OSWALD

  • Hero Member
  • *****
  • Posts: 580
on: Jun 27, 2018
Explain the function of the lacrimal sac.
 
  What will be an ideal response?

Question 2

Describe the layers of pleura and how they prevent friction caused by breathing.
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

dpost18

  • Sr. Member
  • ****
  • Posts: 345
Reply #1 on: Jun 27, 2018
Answer to Question 1

The enlargement of the upper portion of the lacrimal duct is known as the lacrimal sac. Tears secreted by the lacrimal glands are pulled into this sac and subsequently forced into the nasolacrimal duct by the blinking action of the eyelids. The sac is dilated and pulls in fluid as the muscles associated with blinking close the lids. The sac constricts, forcing the fluid down the nasolacrimal duct as the lids are opened.

Answer to Question 2

The visceral pleura is the membrane that covers the outside of the lungs. The parietal pleura is the membrane that lines the pleural or lung cavities. Between these two pleura is a small space which is filled with a serous fluid to prevent friction when the lungs expand and deflate.


OSWALD

  • Member
  • Posts: 580
Reply 2 on: Jun 27, 2018
Excellent

jackie

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

Did you know?

Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

A hypothesis that suggests an explanation of the function of the gene that is defective in patients A hypothesis that suggests an explanation of the function of the gene that is defective in patients
Hemodialysis. The process of hemodialysis replaces the kidney function of blood filtration by forcin Hemodialysis. The process of hemodialysis replaces the kidney function of blood filtration by forcin
How to plot a cosine function containing an amplitude and phase-shift (Question 1 of 2) How to plot a cosine function containing an amplitude and phase-shift (Question 1 of 2)
How to find the anti-derivative of a function (Part 2) How to find the anti-derivative of a function (Part 2)
Sketch a graph of the function h(x), by hand on the following interval: Sketch a graph of the function h(x), by hand on the following interval:
Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ... Under ideal conditions, a single cell of the bacterium E. coli would divide every 20 minutes to ...
Video: Methods that regulate pH

For a complete list of videos, visit our video library