Mei wants to study whether heart rate increases more during certain exercises than during others. She designs an experiment to test the heart rates of classmates in the morning and in the evening for three days, immediately after doing jumping jacks, doing push-ups, or running in place. What is the dependent variable in this experiment

Answers

Answer 1

Answer:

The dependent variable in the experiment given above is THE HEART RATE.

In every experimental set up, there are usually two major type of variable, these are dependent and independent variables. Dependent variable refers to those variable that their values depend on the value of others while independent variable refers to those variable whose values do not depend on any other variable. In the question given above, the heart rate is the dependent variable because its value depend on the type of exercise that a participant undergo.

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During inhalation, air continues to move into the lungs until:_____A) the internal pressure is the same is atmospheric pressure.
B) the internal pressure is less than atmospheric pressure.
C) the internal pressure is greater than atmospheric pressure.
D) the compliance of the lung decreases.
E) the lungs recoil.

Answers

Answer:

(B) the internal pressure is less than atmospheric pressure.

Explanation:

The process of respiration is divided into two distinct phases, inspiration (inhalation) and expiration (exhalation). During inspiration, the diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.

Hence, as the thoracic cavity increases in volume the lungs are pulled from all sides to expand, causing a drop in the pressure (a partial vacuum) within the lung itself. As such the internal pressure is less than atmospheric pressure.

During expiration, diaphragm contracts inferiorly and thoracic muscles pull the chest wall outwardly (the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases). As a result, the lungs contract and air is forced out.

During inhalation, air continues to move into the lungs until the internal pressure is the same is atmospheric pressure. Correct option is A.

During inhalation (inspiration), the diaphragm and other respiratory muscles contract, expanding the thoracic cavity. This expansion increases the volume of the lungs, leading to a decrease in the internal pressure within the lungs. As a result, the air from the surrounding atmosphere (which has higher pressure) flows into the lungs, filling them with fresh oxygen. Inhalation continues until the internal pressure in the lungs equals the atmospheric pressure, at which point the flow of air stops, and the lungs are filled with the appropriate amount of air for that particular breath. This process is essential for proper gas exchange, where oxygen is taken into the bloodstream and carbon dioxide is expelled from the body during exhalation (expiration).

To know more about inhalation:

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Why do arteries need to be thick, muscular, and elastic? to make our bodies strong for movement

to withstand the pressure of the blood that is being pumped by the heart

to pull the blood back to the heart from all areas of the body

to withstand changes in blood temperature

Answers

Arteries need to be thick, muscular and elastic IN ORDER TO WITHSTAND THE PRESSURE OF THE BLOOD THAT IS BEING PUMPED BY THE HEART.

The walls of the arteries are thicker and more muscular than that of veins because of the work that they perform. The arteries have thick and muscular walls, which help them to withstand and absorb the pressure waves that are generated as a result of blood pumping from the heart. The elasticity of the arteries help them to generate appropriate pressure for supporting blood flow.

The answer is to withstand the pressure of the blood that is being pumped from the heart, because the pressure can change based on activity levels.

A new highly nutritious crop is going to be planted in an area where it has never been planted before. Which is the most likely outcome of such an event?

Answers

It will threaten local biodiversity.

The new plants planted in an area where they have never been planted before are called introduced species. They can greatly affect local ecosystem. In the new area, they have no natural predators and are able to spread. If they spread beyond the area they are planted, they become invasive species which can overgrow native biotopes and are a great threat to the local biodiversity. This could lead to the extinction of some native species.

Answer:

negative as it threatens local biodiversity

Explanation:

Soils vary throughout the world because _____.A.the composition is based on the parent rock in that location
B.people use soil differently
C.animals use soil in different ways
D.some countries do not have legislation protecting soil

Answers

Answer: A. the composition is based on the parent rock in that location.

Soil is formed by the process of withering of rock. Withering is a process of break down of rock into small fragments and further into small particles which aggregate in the form of soil by the action of agents like water and wind. The type of rock in a particular region may not be found other regions of the world. Also, the soil composition varies depending upon the type of parent rock withered to form that soil. Therefore, soil vary throughout the world because the composition is based on the parent rock in that location.

Soils vary throughout the world because the composition is based on the parent rock in that location.

Answer: A. The composition is based on the parent rock in that location.

What is a rain shadow?

Answers

A rain shadow is a region having little rainfall because it is sheltered from prevailing rain-bearing winds by a range of hills. Hope that helps. ☺

The Tasmanian devil species ( Sarcophilus harrisii) can only be found on the island of Tasmania. What has this geographical isolation caused in the species of the Tasmanian devil?A decrease in genetic variation
A decrease in sleep habits
An increase in adaption skills
An increase in potential reproduction mates

Answers

The geographical isolation of the Tasmanian devil species has caused a decrease in genetic variation.

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Lorraine and Albert are discussing neurotransmitters, getting ready for an exam. Lorraine maintains that neuronal dendrites sort excitatory and inhibitory messages through a process of elimination dictated by reuptake activity. Albert, on the other hand, argues that inhibitory messages always cancel out excitatory messages. Who is correct? A. Neither Lorraine nor Albert is correct. B. Albert is correct. (wrong answer) C. Lorraine is correct. D. Both Lorraine and Albert are correct.