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Vlad [161]
3 years ago
9

Which of the following is likely to be researched by an environmental scientist? A. the effect of oil spills on marine animals B

. the anatomy of a platypus C. the chemical composition of a compound D. the velocity of a cheetah .
Biology
2 answers:
erica [24]3 years ago
5 0
<span>a. the effect of oil spills on marine animals</span>
Komok [63]3 years ago
4 0
The environmental scientists are those that dig deeper into the happenings on land, the sea, and the atmosphere. From the given choices, the most likely happening that will be studied by the environmental scientist is the "effect of oil spills on marine animals'. The answer is letter A. 
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The following are required steps in the sliding filament theory of muscle contraction:
Olenka [21]

Answer:

In muscles contraction the correct order of the steps are: A (Nerve impulse reaches the muscle), B (Action potential travels down T-tubules), C (Calcium binds to troponin), D (Tropomyosin moves).

Explanation:

Skeletal muscle contractions are based on different physiological and biochemical phenomena that happen in every cell. These phenomena are due to stimulation produced by somatic motor neurons, which axons get in contact with muscle fibers through a neuromuscular synapse.  In rest, attraction strengths between myosin and actin filaments are inhibited by the tropomyosin. When an action potential is originated in the central nervous system, it travels to the somatic motor neuron membrane: the muscle fiber, and activates the calcium channels releasing it in the neuron. Calcium makes vesicles to fuse with the membrane and release the neurotransmitter named acetylcholine (Ach) into the synaptic space in the juncture. Then, Ach binds to its receptors on the skeletal muscle fiber. This causes the ion channels to open, and positively charged sodium ions cross the membrane to get into the muscle fiber (sarcoplasm) and potassium get out. The difference in charges caused by the migration of sodium and potassium makes the muscle fiber membrane to become more positively charged (depolarized). 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, that make the calcium be released into the sarcolemma. At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to the troponin C, the troponin T alters the tropomyosin by moving it and then unblocks the binding sites. Myosin binds to the uncovered actin-binding sites, and while doing it 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.

7 0
3 years ago
An action potential will not occur unless the membrane potential at the ____________ (the initial segement of the axon) reaches
Artemon [7]
An action potential will not occur unless the membrane potential AT THE VOLTAGE GATED SODIUM CHANNEL reaches a level called THRESHOLD.
An action potential refers to the change in the electrical potential which occurs as a result of the passage of impulses along the membrane of muscle cells or nerve cells. An action potential occurs when there is depolarization of the cell membrane to the threshold stage.
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Hand. Fmcvnnv
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4 0
3 years ago
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SOMEONE HELP PLEASE!! State how the digestive, respiratory, and circulatory systems are connected. State how food is eventually
Cloud [144]

Answer:

Circulatory system, respiratory system, digestive system, excretory system, immune system…so many systems are there and you may be wondering how they work together. Well, how the digestive, respiratory, and circulatory work together will be mainly discussed here to help understand your body better.

I hope it helps you

8 0
2 years ago
As scientists advise about potential risks due to climate change, many coastal areas are preparing for a higher risk of impact P
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