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aleksley [76]
3 years ago
7

When a skeletal muscle contracts, what is happening at the level of the muscle proteins?

Biology
1 answer:
Margaret [11]3 years ago
6 0
Bulk flow systems move substances faster than simple diffusion.
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The antibiotic penicillin is isolated from
kykrilka [37]

The antibiotic penicillin is isolated from <u><em>Penicillium notatum</em></u> fungi

Penicillin was first discovered in 1928 and was used at St. Mary's Hospital, London, by Alexander Fleming to heal wounds due to its antibacterial properties.

Explanation:

Fungi and bacteria usually produce antibiotics (as secondary metabolites) for defense mechanism. They do so to limit competition for resources with other neighboring fungi or bacteria in their environment.  This is why when a fungus or bacteria establishes itself in an environment, you hardly see other fungi or bacteria types growing in their vicinity.

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Two functions of an oesophagus in a ruminant animal
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The esophagus has a simple but significant functions to animals who has it. These functions can be a) to swallow food and serve as a passageway to the stomach and b) may serve to release the eaten food that might have some harmful compositions or chemicals -the vomit response. 
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How does movement of the legs affect the gills of crabs?<br>​
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The beating or fanning movements of three pairs of maxilliped flagella in crabs and crayfish modify exhalent gill currents while drawing water over chemoreceptors on the head. They play an integral part both in signalling by distributing urine odours, and in active chemosensation.

Explanation:

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In Oxygen molecule O2, stability is gained through sharing of​
FromTheMoon [43]

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Trees and plants.

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Trees give us oxygen and plants get rid of carbon dioxide and remake it as oxygen.

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Cars are powered by fossil fuels, which come from the remains of ancient living things that were buried and exposed to high temp
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biosphere and geosphere

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