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nasty-shy [4]
3 years ago
11

“How do humans impacts ecosystems?” Please help! Due Oct 9

Biology
1 answer:
alexandr402 [8]3 years ago
6 0
Human activities such as fishing and game often cause an impact on the ecosystem

human waste enters other natural ecosystems where it can cause them to be unbalanced
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After studying the albedo values for Earth's surfaces, how might smoke filling the atmosphere affect the local forest temperatur
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3 years ago
GENETICS VOCABULARY QUIZ
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1. The story is talking about the dogs fur color.
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3 years ago
How does composting influence resource availability?
ivanzaharov [21]

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Organic waste in landfills generates, methane, a potent greenhouse gas. By composting wasted food and other organics, methane emissions are significantly reduced. Compost reduces and in some cases eliminates the need for chemical fertilizers. Compost promotes higher yields of agricultural crops.

Explanation:

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3 years ago
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You measure levels of Ca2+ in various locations within a motor neuron and a skeletal muscle fiber when the motor neuron is NOT d
gogolik [260]

Answer:

The correct answer is 3: "<em>High levels of Ca2+ are expected to be found </em><em>within the sarcoplasmic reticulum</em>".

Explanation:

Muscular contraction is a highly regulated process that depends on free calcium concentration in the cytoplasm. Amounts of cytoplasmic calcium are regulated by <u>sarcoplasmic reticulum</u> that functions as a storage of the ion.

When a nerve impulse reaches the membrane of a muscle fiber, through acetylcholine release,  the membrane depolarizes producing the entrance of calcium from <u>extracellular space</u>. The impulse is transmitted along the membrane to the sarcoplasmic reticulum, from where calcium is released.  At this point, <em>tropomyosin is obstructing binding sites for myosin on the thin filament</em>. The calcium channel in the sarcoplasmic reticulum controls the ion release, that activates and regulates muscle contraction, by increasing its cytoplasmic levels. When <em>calcium binds to the troponin C</em>, <em>the troponin T alters the tropomyosin by moving it and then unblocks the binding sites,</em> making possible the formation of <em>cross-bridges between actin and myosin filaments.</em> When myosin binds to the uncovered actin-binding sites, ATP is transformed into ADP and inorganic phosphate.

Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band, and producing muscle fiber contraction.

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3 years ago
Cual de las siguientes opciones define mejor la interacción ecológica entre la planta y las polillas
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Answe

Explanation:

Cual de las siguientes opciones define mejor la interacción ecológica entre la planta y las polillas

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