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 92 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
Great answer, keep it coming :)

flexer1n1

  • Member
  • Posts: 373
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

Did you know?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

Human immunodeficiency virus gains entry into helper T cells, uses the cell DNA to replicate, interf Human immunodeficiency virus gains entry into helper T cells, uses the cell DNA to replicate, interf
How to use L'Hospital's Rule to find the limit of a function (Part 2) How to use L'Hospital's Rule to find the limit of a function (Part 2)
How to use the squeeze theorem to find the limit of a function How to use the squeeze theorem to find the limit of a function
Structure and function of complex I (NADH–coenzyme Q reductase) Structure and function of complex I (NADH–coenzyme Q reductase)
Testing motor function of cranial nerve VII - Frown Testing motor function of cranial nerve VII - Frown
Discrete random variables- Probability Distribution Function Discrete random variables- Probability Distribution Function
Video: Summary of female reproductive cycle days 1-28

For a complete list of videos, visit our video library