chapter 18 - transport system (part 2)
TRANSCRIPT
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TRANSPORT
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PREVIOUS
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LECTURE
18.1:
MAMMALIAN
HEART AND
ITS REGULATION
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OBJECTIVES
At the end of this topic, students should be able to:
Explain cardiac cycle.
Explain the factors affecting heart beat.
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The sequence of events that makes up one heart beat
(about 0.8 seconds).
Cardiaccycle
Systole heart
muscle contract
Consists of : Diastole heart
muscle relaxed.
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0.15 SEC SYSTOLE DIASTOLE
0.30 SEC DIASTOLE SYSTOLE
0.40 SEC DIASTOLE DIASTOLE
Cardiac cycle
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Ventricular Systole
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Ventricular Systole
The pressure force open
semilunar valve of aorta and
pulmonary artery
High pressure forces the blood
into aorta and pulmonaryartery
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Ventricular Diastole
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13/35Copyright 2002 Pearson Education, Inc., publishing as Benjamin CummingsFig. 42.6
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Campbell 9th edition pg 952
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Recordingelectrical
changes(activity)
that occur during
cardiac cycle.
Electrocardiogram is
taken todetect the
abnormalities that
may confirm asuspected heart
attack.
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Factors affecting heart beat
The heart rate is the number of times that your heart
beats per minute.
For a healthy adult at normal resting, such as first thing
in the morning, the heart rate is between 60 to 100 beats
per minute
There are many factors affecting the heart beat,i. Body temperature
ii. Blood pH
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High temperatures can increase heart rates
When the temperature jumps to 75 from 60 0F, a
person's heart rate will increase by two to four
beats per minute. If the temperature rises from 75 to 90 0F, heart
rate will raise by about 10 beats per minute
Body temperature may increase during
Fever
exersice
Body Temperature
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Body Temperature increase
during exercise
The working muscles produce heat that raises thebody temperature.
This stimulates the brain to trigger the skin to
produce sweat.The blood vessels in the skin dilate to allow a
greater volume of blood to flow into the skin tofacilitate heat transfer to the sweat.
The heart rate increases to push more blood intothe skin where the heat will be lifted away throughsweat evaporation
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When we exercise the level of carbon dioxide in the
body increases while the level of oxygen decreases
Increase in CO2 level will decrease in blood pH (due to
the concentration of H+)Chemoreceptor (at aorta, and the carotid arteries in the
neck) signal the brain when CO2 levels are too high in the
blood.
The brain stimulates the heart rate to increase in order
to accelerate processes that remove excess CO2, including
blood filtering in the lungs and kidneys.
Blood pH
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cardiac cycle.mp4
Conclusion
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Human lymphatic system
Transport of lipids from small
intestine into the blood stream