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Mnenie [13.5K]
3 years ago
14

Why are external barriers important to our immune system?

Biology
1 answer:
solniwko [45]3 years ago
7 0

Answer:

Maybe it was because external barriers can attack to our body and it can hurt us

Explanation:

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Unlike skeletal muscle action potentials, cardiac muscle action potentials __________.
ivolga24 [154]

Answer:

involve calcium voltage-gated channels

Explanation:

5 0
2 years ago
Chlorophyll is essential to photosynthesis because it traps the _______________ needed. A. oxygen B. carbon dioxide C. sunlight
denpristay [2]

Answer:

sunlight

Explanation:

cawg

6 0
3 years ago
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How would you make 2.5 liters of an aqueous solution containing 150mM Tris (the MW of Tris is 120g/mole)? (Hint: Do the necessar
lisabon 2012 [21]

Answer:

45 g of the solid Tris will be dissolved in 2.5 liters of water.

Explanation:

Recall that:

<em>Number of moles  = molarity x volume</em>

Hence, number of moles of Tris present in 2.5 liters, 150 mM solution:

= 150/1000 x 2.5 = 0.375 moles

Also, recall that:

<em>No of moles of substance = mass/molar mass.</em>

Hence, mass of 0.375 moles substance:

= no of moles of the substance x molar mass of the substance.

= 0.375 x 120 = 45 g.

Therefore, in order to prepare 2.5 liters, 150 mM of an aqueous solution of Tris, 45 g of the solid Tris will be dissolved in 2.5 liters of water.

6 0
3 years ago
What type of water do corals live in?
nirvana33 [79]

Answer:

C.

Explanation:

C. Warm and shallow, even though they can be found in deeper water they do better the more shallow the water is. They also live in tropical places and in salt water. They can not survive in fresh water or cold water for very long.

Hope this helps, if so please mark the brianlist and peace and love

6 0
3 years ago
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Lymphatic system- is it open or closed? explain what it means
Aleonysh [2.5K]
Lymph is the excess blood plasma after it is filtered from interstitial fluid, when the interstitial fluid is formed.  From the circulation system, after filtration, lymph is comes into to the Lymphatic system.
The Lymphatic system with its tubular vessels, is an open system. It conducts lymph between various parts of the body.  It provides a route for the excess interstitial fluid to be returned back to blood.

On the other hand, Our cardiovascular system - responsible for circulation of blood - is a closed system. Blood never leaves the veins, arteries, and capillaries.

8 0
3 years ago
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