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3 years ago

An action potential does not re-stimulate the adjacent membrane that was previously depolarized because

Biology

1 answer:

Aliun [14]3 years ago

6 0

Answer:

E. that area of the membrane is in the absolutely refractory period.

Explanation:

Refractory period is a period during which neuron cell cannot be stimulated (depolarized). This is why the action potential can only travel in one direction from the neuron body towards axon.

Refractory period occurs because of the inactivation of voltage-gated sodium channels (while action potential is at its peak) which cannot be open for a certain period of time. and membrane cannot be depolarized.

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In which generation will there be almost 100% non-singing females if there are no changes in the birds’ environment and interact

mr Goodwill [35]

It would be generation 5 in which there will be almost 100% non-singing females if there are no changes in the birds’ environment and interactions

3 0

3 years ago

What could a scientist do to determine what era the Eocene Period belongs to on the geologic time scale?

Burka [1]

Answer:

Option B) study information related to the Cenozoic era

Explanation:

The complete question is

Scientists discovered that the Eocene time period existed in Earths history around 34 MYA. What do they need to do to determine what time period Eocene belongs to on the geologic time scale?

A) learn what happened during Precambrian time

B) study information related to the Cenozoic era

C) view the timing of events in the Mesozoic era

D) research events that happened during the Paleozoic era

Solution -

The period of Eocene belong to the Cenozoic era. The Cenozoic era is divided into three periods-

a) The Paleogene – Existed between 65.5 to 23.03 million years ago

b) The Neogene - Existed between 23.03 to 2.6 million years ago

c) The Quaternary – Started some 2.6 million years ago and is continuing till present

The Paleogene is subdivided into three epochs –

A) The Paleocene – existed between 65.5 to 55.8 million years ago

B) The Eocene – existed between 55.8 to 33.9 million years ago and

C) The Oligocene – existed between 33.9 to 23.03 million years ago

Hence, studying about Cenozoic era will give information about the Eocene epoch

Hence, option B is correct

5 0

3 years ago

The physical characteristics of an organism is its: phenotype. genotype. alleles. gametes.

Veseljchak [2.6K]

The physical characteristics of an organism is its phenotype. I remember this because phenotype and physical both start with 'ph.'

Hope this helps. Good luck! :)

6 0

3 years ago

Read 2 more answers

How are red blood cells able to move through narrow vessels to carry oxygen throughout a multicellular organism? (1 point) a)The

geniusboy [140]

Answer:

The correct answer is - option B. They are small because they lack a nucleus.

Explanation:

Red blood cells or erythrocytes are specialized cell that produce in bone marrow and have specific role such as carrying oxygen from lungs to deliver it to the various organs and carry out carbon dioxide.

In mammals these cells lack cell organelles such as nucleus and mitochondria, a major factor that determined its smaller size. The size of RBC are move through narrow vessels throughout a organism because of its specific size and shape that provide it space for hemoglobin and allow to be flexible and bend to move through narrow vessels.

Thus, the correct answer is : option B. They are small because they lack a nucleus.

8 0

3 years ago

Does someone know what this says

kati45 [8]

I see half of it and what are you working on?

7 0

3 years ago