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9966 [12]
3 years ago
7

In the structure of a muscle, several fascicles lie bundled together to forma muscle, just as several lie together to form compa

ct bone tissue. Each muscle fiber, which is a muscle cell, consist of protein fibers. Similary, the matrix that lies outside bone cells consists of a protein fiber called
Biology
1 answer:
astra-53 [7]3 years ago
3 0

Collagen is a protein fiber that is found in the matrix that lies outside the bone cells. Population of these collagen fibers that scattered through the matrix are embedded in a gel-like ground substance called hyaline cartilage, which is flexible but avascular and contains no nerves or blood vessels.

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Organisms with radial symmetry would likely _________________________________.
Illusion [34]
Be sessile (move from place to place very slowly, or not move at all)
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3 years ago
When a muscle cell contracts, Group of answer choices the position of each myosin head is identical at any given moment. some my
White raven [17]

Answer:

When a muscle cell contracts, the myosin heads each produce a single power stroke.

Explanation:

In rest, attraction strengths between myosin and actin filaments are inhibited by the tropomyosin. When the muscle fiber membrane depolarizes, the action potential caused by this depolarization enters the t-tubules depolarizing the inner portion of the muscle fiber. This activates calcium channels in the T tubules membrane and releases calcium into the sarcolemma. At this point, <em>tropomyosin is obstructing binding sites for myosin on the thin filament</em>. When calcium binds to the troponin C, the troponin T alters the tropomyosin by moving it and then unblocks the binding sites. Myosin heads bind to the uncovered actin-binding sites forming cross-bridges, and while doing it ATP is transformed into ADP and inorganic phosphate which is liberated. Myofilaments slide impulsed by chemical energy collected in myosin heads, <u>producing a power stroke</u>. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament.  Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin.  Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band, and producing muscle fiber contraction.

3 0
3 years ago
Which of these are effects of environmental change on individual organisms? Check all that apply. 1.death 2.loss of habitat 3.ch
NemiM [27]

Answer:

A) death

B) loss of habitat

D) impacts on growth and development  

F) a decrease in resources

Explanation:

Just answered it and got it right!!! Hope this helps!!!

3 0
3 years ago
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If europhication continues what will eventually happen to the lake and the surrounding area
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Then the submerged aquatic plants will note be able to receive light for photosynthesis. then those submerged aquatic plants will not have food/nutrients to survive, hence die. aquatic animals will not receive sufficient oxygen from those submerged aquatic plants, hence die also.
decomposes will breakdown all dead organisms to release carbon dioxide, and also deplete oxygen concentration during decomposition process.

eventually, habitat is rendered not livable. only the algae continue to proliferate uncontrollably at the water body surface.
7 0
3 years ago
Given the reaction below:
Ksenya-84 [330]

Answer:

Fe + CuSO4(aq) → FeSO4(aq) + Cu(s) The type of reaction is a displacement reaction. In this reaction, the highly reactive metal iron replaces the Copper in copper sulphate by giving up two electrons and gets oxidized and forms a new compound called ferrous sulphate.

5 0
2 years ago
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