1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ulleksa [173]
3 years ago
5

Elias conducted an experiment about the effects of exercise on the heart rate of teenagers. Before morning basketball practice,

he asked the members of his high school team to be his subjects. He measured each of their heart rates before and after a set of exercises. Which change would most reduce the bias of his experimental design?
Biology
2 answers:
padilas [110]3 years ago
8 0

The <u><em>correct answer</em></u> is:

He needs to select a more representative sample.

Explanation:

Choosing students from the basketball team for the sample he uses on a study of heart rates and exercise will be a biased sample.  This is because students on the basketball team are potentially healthier than other students, which means that exercise will not have a large an effect on their heart rate as it would if they were not as healthy and not as physically fit.

In order to reduce the amount of bias, he should choose students from different groups throughout the school.

densk [106]3 years ago
6 0
Well obviously he would need to make sure that the exercise is very well controlled.
But I think the most important aspect he needs to change is the people. Firstly, the subjects are all boys. They are also all obviously already quite fit (because they are in a sports team), and they are all around the same age. Results could vary if the sex, fitness and age of people also differs. It is therefore important to record results from a wide range of people.
You might be interested in
Light dependent reactions Where does it occur? What is happening to the electrons? What is happen to the oxygen? What is happeni
Ivenika [448]

Answer:

In oxygenic photosynthesis, the first electron donor is water, creating oxygen as a waste product. In anoxygenic photosynthesis various electron donors are used. Cytochrome b6f and ATP synthase work together to create ATP. This process is called photophosphorylation, which occurs in two different ways.

Explanation:

3 0
3 years ago
Debido a la baja cantidad de calorías que utilizamos o quemamos en un día de trabajo
Delvig [45]

Answer: Se debe a que el cuerpo lleva a cabo funciones fisiológicas vitales que requieren energía.

Explanation:

Las calorías son unidades de energía aportadas por los alimentos que consumimos a diario. Puntualmente se define la cantidad de calor necesaria para aumentar en 1 grado centígrado a la temperatura de 1 gramo de agua desde 14,5 hasta 15,5. La principal fuente de calorías en los alimentos son los hidratos de carbono, luego le siguen las grasas y proteínas.

<u>Dicha energía hallada en los alimentos, es utilizada por el cuerpo para llevar a cabo distintas funciones fisiológicas vitales e importantes para que el organismo funciones correctamente</u>, como el bombeo de sangre del corazón, funcionamiento de los riñones o el actividad del cerebro, etc. Nos referimos a esto como el metabolismo basal, el cual es el valor mínimo de energía utilizada en reacciones químicas celulares para la supervivencia del organismo. Dicho metabolismo basal depende de diversos factores tales como la edad, peso, sexo, etc. Pero también, las calorías son necesarias para distintas actividades voluntarias como caminar o levantar algún objeto.

<u>Sin embargo, la forma de energía de las calorías de los alimentos es distinta a la forma de energía necesaria para llevar a cabo estas funciones fisiológicas tanto voluntarias como involuntarias.</u> Para ello, la energía de las calorías debe de convertirse a otra forma y esto ocurre comenzando primero con la digestión de los alimentos, donde luego sus nutrientes son absorbidos en el torrente sanguíneo para luego dirigirse a las células. En las mismas, ocurre un proceso llamado respiración celular, en donde se utilizan las calorías de los alimentos para sintetizar ATP (Adenosín Trifosfato), la cual es una molécula que almacena energía utilizable por parte de las células y que eventualmente impulsará y llevará a cabo todos los procesos fisiológicos y metabólicos.

Entonces, en el caso del trabajo de una oficina en el que las personas permanecen sentadas largas horas, sin mucha actividad, <u>igualmente necesitan consumir mas de 2.000 kilocalorías diarias ya que el cuerpo debe obtener esa energía para llevar a cabo las funciones de todos los órganos para mantenerlos vivos.</u>

3 0
2 years ago
How does an object look when it is viewed through a transparent object? a The object is clear but the shape is distorted. b The
Serhud [2]
The object can be seen clearly
8 0
2 years ago
How is the reproductive system different from<br> other body systems?<br> I
Zepler [3.9K]
The reproductive system is different from other body systems in that the reproductive system functions in the survival of a species while all other body systems function to ensure the survival of the individual.
5 0
3 years ago
Is the function of an endocrine system to move muscles or deliver oxygen or break nutrients?
Pani-rosa [81]

The endocrine system is made of glands that secrete hormones. These hormones help regulate the organs and cells activity. The hormones among other things control your metabolism.

5 0
3 years ago
Other questions:
  • The ______ is the sum of all genetic information carried by the members of a population. A)gene flow B)genetic drift C)gene pool
    9·2 answers
  • Research the group sarcopterygii and explain why all terrestrial vertebrates from cows to humans are included in this group whic
    6·1 answer
  • Substrate-level phosphorylation directly generates ATP during a chemical reaction. As a single molecule of glucose is completely
    12·1 answer
  • (Fill in the blank)
    8·1 answer
  • What are the main structures and functions of the musculoskeletal system? What are the main structures and functions of the inte
    11·2 answers
  • the mississippi river carries tons of tiny rock fragments called sediments into the gulf of mexico. what do you think will happe
    8·1 answer
  • If your mom has 46 chromosomes and your dad has 46 chromosomes, how many chromosomes do you have?​
    10·2 answers
  • ___________ are large, multicellular autotrophs that animals eat. Some early plants do not have a vascular system which means th
    13·1 answer
  • I’m very confused on this question so i rlly need help asap
    13·1 answer
  • What do animals such as clams and oysters extract from the water to build their shells?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!