Ciencias

Páginas: 3 (628 palabras) Publicado: 21 de noviembre de 2012
Gimnasio Británico
Biology
María del Pilar Malagón Triviño
10 c
-------------------------------------------------
13-11-2012
LAB REPORT:
Hearth beating

DESIGN
Aspect 1: Defining theproblems and selecting variables.
1.1 Research Question: How does the hearth beating changes depending on the temperature?
1.2 Alternative hypothesis: The hearth beating increases whenthe person is in a higher temperature, and when it is in a lower temperature it decreases. Null hypothesis: The hearth beating doesn´t have achange.

1.3
Independent variable | Dependent variable | Constant variables |
- People (They are between15 and 16 years) -Water (Ice) | -Hearth beating | -Temperature (C°)-Time in which hearth beating is measure (1 min) |

Aspect 2: Controlling variables.

2.1 For assure the effective control ofthe constant variables there will be applied some methods. For the temperature, it will be used a thermometer, this temperature is the water temperature and it will be taken only one time by eachperson because not all the samples will be made at the same time, this mean that we have heat the water for each person, but it is going to be the same temperature for all the people. In addition, tomeasure the hearth beating in a determined time, we will use a stopwatch.
2.2 The apparatus that will be used for measuring the hearth beating is a hearth rate sensor, which is connected to adatalogger. So when the person has their hands in the water for one minute, immediately grabbed the sensor and thus the heart beating will be measured.

Control Variables | Method of control | Units |Possible effect on result |
Temperature | With a thermometer the temperature of the water in which the experiment is going to be done will be measured. | Celsius(C°) | For the hearth beating the...
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