Question

lymph is kept moving in the larger lymph vessels by milking action of skeletal muscles
true
false
question 12
1 pts
all but which of the following are good barriers to invasion by microbes?
urine
eye secretions
mucous membranes
gut bacteria
broken skin

Explanation:

1. For the first - question: The contraction and relaxation of skeletal muscles act like a 'milking' action to help move lymph through larger lymph vessels. So the statement is true.
2. For the second - question: Urine, eye secretions, mucous membranes, and gut bacteria are all part of the body's defense mechanisms against microbial invasion. Urine flushes out microbes, eye secretions have antibacterial components, mucous membranes trap microbes, and gut bacteria compete with harmful microbes. Broken skin, however, is a portal of entry for microbes rather than a barrier.

Answer:

1. True
2. broken skin