Investigating Factors that Affect Heart Rate and Blood Pressure

Investigating Factors that Affect Heart Rate and Blood Pressure

Length: 709 words (2 double-spaced pages)

Rating: Excellent

Open Document

Essay Preview

More ↓
Investigating Factors that Affect Heart Rate and Blood Pressure

Blood pumped through blood vessels is always under pressure. This
pressure is highest in the arteries closest to the heart and gradually
decreases as the blood travels around the body. Blood keeps moving
around the body because there are differences in pressure in the blood
vessels. Blood flows from higher-pressure areas to lower-pressure
areas until it eventually returns to the heart. Blood pressure is
controlled by three things: heart rate, stroke volume and peripheral
resistance. Generally, when heart rate increases, blood pressure
rises, and vice versa. A number of things affect heart rate, such as
body's temperature, nervous system, hormones, medications, and
diseases, etc. The amount of blood pumped out of a ventricle with each
heartbeat is called stroke volume. When you're resting, stroke volume
is about the same as the amount of blood that veins carry back to the
heart. But under stressful conditions, the nervous system can increase
stroke volume by making the heart pump harder. Width of arteries also
affects the blood pressure. Blood traveling in narrower vessels meets
more resistance than blood traveling through a wider vessel. Depending
on what a person is doing, the amount of blood the heart pumps varies
enormously. Yet the blood pressure normally remains pretty stable.
That's mainly because the body adjusts the resistance of the arteries,
either widening or narrowing them as appropriate, to prevent the blood
pressure from swinging wildly. This ability to regulate the width of
the blood vessels is called the peripheral resistance. Most of the
resistance to blood flow in the circulation occurs in the
small-diameter arteries called arterioles. These arterioles are
especially important in the immediate regulation of blood pressure.
Generally, a change in any factor that may cause the blood pressure to
rise is balanced by a change in another factor. This is how the body
keeps blood pressure in a normal range.

The purpose of this lab is to identify the difference between blood
pressure and heart rate, and to analyze the factors that may affect

How to Cite this Page

MLA Citation:
"Investigating Factors that Affect Heart Rate and Blood Pressure." 20 Mar 2019

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Investigating The Factors That Affect The Rate Of Transpiration Essay

- Purpose: The primary purpose of this experiment was to find out what environmental factors if at all affect the rate of transpiration. Transpiration is the process in plants which water taken from the roots are evaporated at the leaves. For the water to be transported through the plant, surface tension, adhesion and cohesion are important as it holds the water together and attached to other surfaces. If transpiration is affected by environmental factors, then increasing the wind and light/temperature will have a direct correlation of transpiration rate; furthermore, wind and light/heat combined will affect the rate larger than just one factor by itself....   [tags: Water, Evaporation, Experiment, Transpiration]

Research Papers
755 words (2.2 pages)

Investigating Factors that Affect the Rate of Reaction Essay

- Investigating Factors that Affect the Rate of Reaction There are certain factors which affect the rates of reaction in an experiment. These factors are: · Pressure · Temperature · Concentration * Surface area / particle size and * The addition of a catalyst The factors that I will be concentrating on are temperature, concentration and surface area / particle size. Pressure Pressure influences the rate of reaction only when the reactants are in their gas phase....   [tags: Papers]

Free Essays
537 words (1.5 pages)

Factors That Affect the Rate of Reaction Essay

- Factors That Affect the Rate of Reaction Background ========== We can measure the rate of reaction by measuring the rate of change by either, - one of the reactants disappearing with time - one of the product forming with time. A chemical reaction can only occur between particles when they collide (hit each other). Particles may be atoms, ions or molecules. There is a minimum amount of energy which colliding particles need in order to react with each other. If the colliding particles have less then this minimum energy, then they just bounce off each other and no reaction occurs....   [tags: Papers]

Free Essays
2871 words (8.2 pages)

Investigating the Effects of Concentration on the Rate of Reaction Essay

- Investigating the Effects of Concentration on the Rate of Reaction Chemistry Coursework Aim: To investigate the effect of concentration on the rate of reaction between magnesium and hydrochloric acid. Introduction: This investigation is done to find out the rate of reaction between the two substances. I will be changing the concentration of the hydrochloric acid and adding the same amount of magnesium to each beaker. As I change the amount of hydrochloric acid, I would be diluting water with it....   [tags: Papers]

Free Essays
1024 words (2.9 pages)

Investigating the Factors Which Affect Osmosis Essay

- Investigating the Factors Which Affect Osmosis The aim for this Biology coursework is to investigate hoe the concentration of sodium chloride will affect the mass of potato chips that will be the same length and have same width. The time factor for the chips will be the same to make it a fair test. The main variables throughout the investigation will be the mass, the length and the concentration in which the chips are kept in. Scientific knowledge of osmosis Osmosis is the movement of water particles across a semi permeable membrane, from a dilute solution to a more concentrated solution, until equilibrium is established, i.e....   [tags: Papers]

Research Papers
2002 words (5.7 pages)

Investigating Factors Which Affect The Reaction Between Chalk and An Acid

- Investigating Factors Which Affect The Reaction Between Chalk and An Acid Introduction: Chalk is just one of many forms that calcium carbonate can take. It is made of the mineral remains of sea creatures from millions of years ago. It is quite soft, but solid. It reacts with hydrochloric acid like this 2 CaCO3 + 2 HCl → CO2 + CaCl2 + H2O producing Carbon Dioxide, which is what we measure in the experiment. There are different factors affecting the rate of this reaction, such as: * Temperature * Concentration of acid * Surface area of chalk * Pressure * Light intensity (this is a very small affect so it doesn't really count an...   [tags: Papers]

Free Essays
856 words (2.4 pages)

Investigation of the Rate of Reaction Essay

- Investigation of the Rate of Reaction Concentration: If the concentration of a solution is increased there are more reactant particles per unit volume. This increases the probability of reactant particles colliding with each other. Pressure: If the pressure is increased the particles in the gas are pushed closer. This increases the concentration and thus the rate of reaction. Surface Area: If a solid is powdered then there is a greater surface area available for a reaction, compared to the same mass of unpowdered solid....   [tags: Papers]

Free Essays
676 words (1.9 pages)

Investigation of Rate of Reaction Essay

- Investigation of Rate of Reaction INTRODUCTION ------------ I will be conducting an experiment on the rate of reaction for my GCSE coursework. . We will be reacting sodium thiosulphate with hydrochloric acid. I will be investigating the effects had on rate of reaction. When sodium thiosulphate and hydrochloric are mixed, a yellow precept of sulphur is produced. The solution becomes increasingly difficult to see through as more and more sulphur is formed. WHAT IS RATE OF REACTION....   [tags: Papers]

Free Essays
1649 words (4.7 pages)

The Effect of Concentration on the Rate of Reaction Essays

- The effect of concentration on the rate of reaction between sodium thiosulphate and dilute hydrochloric acid This investigation is about rates of reaction and what affects them. In this case I am going to look at hydrochloric acid and sodium thiosulphate which is a precipitation reaction causing the solution to go 'cloudy'. They react as in the equations below: sodium thiosulphate + hydrochloric acid -> sodium chloride + sulphur + sulphur dioxide + water Na2S2O3(aq) + 2HCl(aq) -> 2NaCl(aq) + S(s) + SO2(g) + H2O(l) A reaction will only occur where the particles of the reactants meet and combine....   [tags: GCSE Chemistry Coursework Investigation]

Free Essays
2593 words (7.4 pages)

Investigating the Relationship Between the Transpiration Rate of a Shoot and the Degree of Opening of the Stomata of Its Leaves

- Investigating the Relationship Between the Transpiration Rate of a Shoot and the Degree of Opening of the Stomata of Its Leaves I will be investigating the relationship between the transpiration rate of a shoot and the degree of opening of the stomata of its leaves. Transpiration is the loss of water vapour from the surfaces of a plant. Solar energy turns the water in the plants into a vapour causing it to evaporate into the leafÂ’s internal air spaces before diffusing out of the stomata into the air....   [tags: Papers]

Free Essays
1201 words (3.4 pages)

Related Searches

them. Time will be an independent variable.

1. Measure the sitting heart rate.


a. Feel with the fingertips of your index and middle finger for
your pulse point until you detect pulsations.

b. Keep yourself as still as possible while you are taking your
heart rate.

c. Count the number of heartbeats you feel in one minute. Record
the results.

d. Repeat the procedure for your partner.

e. Graph and compare results.

3. Measure the sitting blood pressure.

a) Student patient should extend arm on table with palm up.

b) Place blood pressure cuff above the bend in the arm. The cuff
should be snug yet have enough room to insert two fingers.

c) Check to see if valve is open or closed.

d) Place stethoscope ear tips into ear.

e) Position stethoscope on arm to hear pulse.

f) Pump pressure up to 160 mm.

g) Release valve slowly.

h) The first pulse sound you hear as you release the valve is the
systolic pressure.

i) Have the student patient place their finger on the number of the
first sound to mark the spot.

j) Continue to release the valve. Approximately 40 mm down from the
first sound you will hear is called the diastolic pressure.

k) Record the systolic and the diastolic pressure on the chart.

3. After lying for 5min measure the lying heart rate and blood

4. Choose factors that might cause a change in heart rate and blood


* exercise à moderate: walking (5 min)

* exercise à intense: running up and down the stairs/ hallway (3

* diet: caffeine, sugar, salt, aspirin

6. Make a bar graph of results.

7. Present, analyze, and compare results in class.

1. What kind of effects did you see in blood pressure and heart rate?

2. What are different factors that could affect blood pressure and
heart rate?

3. Would there be a difference in sitting and lying blood pressure and
heart rate, and why?

4. Compare the blood pressure and heart rate. Are there any
similarities or differences in the changes?

A typical normal blood pressure is 120/80 mm Hg, or "120 over 80." The
first number represents the pressure when the heart contracts. The
second number represents the pressure when the heart relaxes. Blood
pressure greater than 140/90 mm Hg is considered high. When you begin
to exercise, your heart rate increases, as does the amount of blood
pumped out of the heart with each beat. This would normally increase
the blood pressure. But the blood pressure remains normal because the
blood vessels widen in order to increase the capacity for the extra
blood being pumped while exercising. This helps offset the increase in
blood pressure associated with the increase in heart rate and stroke
volume associated with exercise. On the other hand, if blood pressure
suddenly drops, a series of changes restores normal blood pressure.
These include short-term increases in heart rate, the strength of the
heart's contractions, and peripheral resistance. Over a longer time
period, blood volume also increases due to the actions of hormones on
the kidneys.
Return to