Biology IB Laboratory report

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Science Department

Biology IB Laboratory report

STUDENT’S NAME: Marco Sarmiento Castro                                DATE:   8 /February /  2018                 GRADE: 11*A

TEACHER’S NAME: Andrea Bonilla

TOPIC: Heart Beat

1. DESIGN

Background information:

The heart rate is regulated by the concentration of heart muscle, the sinoatrial node is a primary pacemaker, and this means is the one that controls the rate at which the heart beats. The brain sends an electrical signal, which travels through nerves, or chemical signal that travels though the blood. Talking about the electrical signal there are two nerves involve d, the sympathic nerve that release the neurotransmitter noradrenaline to increase the heart rate and the parasympathic nerve realizes the neurotransmitter acetylcholine to decrease the heart rate. The chemical signals are the hormones, which make heart rate undergo a sustained increase in order to prepare to vigorous physical activity. The hormone adrenalin increases heart rate by activating the same chemical pathways as the neurotransmitter noradrenalin. Finally the process goes like this; the brain sends either an electrical or chemical signal that is received by the sinoatrial node which makes the atrium to contract, sending the blood to the ventricles after this the SA sends a signal to the atrioentricular node which makes ventricles to contract and this sends the blood to the lungs and body.

The blood flow is regulated by the structure of the blood vessels, in the case of the veins their structure doesn’t support enough preasure, because they are thicker and muscular, they have the ability to contract and expand so they can increase or decrease the blood preasure. The sympathetic nerve sends signals to the arteries for them to contract in the limbs where there in on much blood needed and the arteries dilate where they is a high amount of blood needed. “BioNinja, (2016). IB BioNinja. Ib.bioninja.com.au.” “Crash course, Green. Hank, (2015). The herart, part 1.  )

Research question:

¿How time affects the heart rate?

Hypothesis:

During exercise, pulse rate increases because the less time a person takes to finish the path , it has a higher speed, which causes the adrenaline hormone or the neurotrasmiter noradrenali to increase the heart rate.

Variables:

Tabla 1

Requirements:

Table 2

Methodology:

1. Select a person for doing exercise and another who is in charge of measuring the time and counting the heart rate (pulse) for 15 seconds before and after exercising.
2. Measure the journey that the person who is going to do the exercise will perform.
3. Measure the heart rate of person before performing the exercise for 15 seconds.
4. The person would perform the path in the shortest time as possible.
5. Record the time he spend on the path and immediately measure the heart rate of that person who do exercise.
6. Chance roles and repeat steps 3 to 5.

1. DATA COLLECTION AND ANALYSIS

OBSERVATIONS

A.  QUANTITATIVE.

RAW DATA:

PROCESS DATA:

B.  QUALITATIVE

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