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laila [671]
1 year ago
13

What depolarizes producing the P wave, which generates a wave of contraction

Biology
1 answer:
skelet666 [1.2K]1 year ago
5 0

Answer: The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria. The P wave should be upright in lead II if the action potential is originating from the SA node.

Explanation:

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How do plants get the nitrogen they need?
ololo11 [35]

Correct answer: D) From bacteria living in their roots

Nitrogen is an essential plant nutrients, but it is metabolically unavailable to higher plants and animals. It is available to some species of microorganism by biological nitrogen fixation in which nitrogen is converted to ammonia with the help of enzyme dinitrogenase.

The process of breaking apart the two atoms in a nitrogen molecule is called nitrogen fixation. Plant obtain the nitrogen they need from the soil which is already fixed by the bacteria and archae.

Example: <em>Azobacter</em><em>,</em> Nostac    

5 0
3 years ago
A biologist examines a series of cells and counts 160 cells in interphase, 20 cells in prophase, 6 cells in prometaphase, 2 cell
Marrrta [24]

Answer:

M phase: 4.8 hr

Prophase: 2.4 hr

Prometaphase: 0.72 hr

Metaphase: 0.24 hr

Anaphase: 0.84 hr

Telophase: 0.6 hr

Explanation:

Mitosis, also known as M phase, is the process of nuclear division after interphase, which is followed by cytoplasmic division via cytokinesis. Mitosis can be subdivided into the following phases: Prophase,  Prometaphase, Metaphase, Anaphase, and Telophase. In this case, 160 cells are in interphase (for a total of 200 cells), thereby 40 cells are in mitosis >> 200 - 160 = 40 cells. Since the complete cell cycle requires 24 hours, it is possible to calculate the average duration of each phase:

M phase: 40/200 = 0.2 x 24 hr = 4.8 hr

Prophase: 20/200 = 0.1 x 24 hr = 2.4 hr

Prometaphase: 6/200 = 0.030 x 24 hr = 0.72 hr

Metaphase: 2/200 = 0.01 x 24 hr = 0.24 hr

Anaphase: 7/200 = 0.035 x 24 hr = 0.84 hr

Telophase: 5/200 = 0.025 x 24 hr = 0.6 hr

3 0
3 years ago
What do you call a star that is fusing hydrogen into helium versus one that is fusing other elements?
laila [671]

Answer:

Fusion powers stars and produces virtually all elements in a process called nucleosynthesis. The Sun is a main-sequence star, and, as such, generates its energy by nuclear fusion of hydrogen nuclei into helium.

Explanation:

Hope thus was helpful, Have a Great day!!

5 0
2 years ago
Phase 1 of the creation of life on earth was the formation of small molecules containing carbon and hydrogen. Phase 2 was the fo
snow_tiger [21]

Answer:

The correct answer will be- formation of membrane

Explanation:

The three-stage origin of life theory suggests that life on Earth originated in three phases which are:

1. Phase I: The larger molecules formation began during this unsuitable earthly conditions full of volcanic eruptions and harmful gases underwater.

2. Phase II: The self-replicating molecule begins to form during this phase which contained the coding of life. The self-replicating molecule is known as the formation of the membrane.

3.Phase III: The formation of the membrane which help separate the outer environment from the inner environment was observed during this phase.

Thus, the formation of a membrane is the correct answer.

8 0
3 years ago
Who would be the best people to study to help assess how genetics and the environment influence the expression of traits?
TEA [102]

identical twins that were adopted and raised by different families

Explanation:

6 0
2 years ago
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