The Human Blood Circulatory system
Humans and other vertebrates have a closed blood circulatory system:
This system consists of
the heart (pump),
series of blood vessels
the blood that flows through them.
This means that circulating blood is pumped through a system of vessels.
Functions of Human Blood Circulatory System
1. oxygen
2. carbon dioxide
3 nutrients
4. water
5. ions
6. hormones
7. antibodies
8. metabolic wastes
It is a powerpoint presentation that discusses about the lesson or topic: Respiratory System. It also talks about the definition, parts and the concepts about Respiratory System.
Powepoint presentation on the Nervous System, its function and composition. Nerves and neurons - Nerve impulses- Synapse- Reflex action- Reflex arc. - Notes on the eye. links to further study
An 8th grade lesson introductory lesson on the circulatory system ... in addition to the powerpoint I had the students take their pulse at rest at the beginning of class and then again during the middle of class after having them run in place for 30 seconds
The Human Blood Circulatory system
Humans and other vertebrates have a closed blood circulatory system:
This system consists of
the heart (pump),
series of blood vessels
the blood that flows through them.
This means that circulating blood is pumped through a system of vessels.
Functions of Human Blood Circulatory System
1. oxygen
2. carbon dioxide
3 nutrients
4. water
5. ions
6. hormones
7. antibodies
8. metabolic wastes
It is a powerpoint presentation that discusses about the lesson or topic: Respiratory System. It also talks about the definition, parts and the concepts about Respiratory System.
Powepoint presentation on the Nervous System, its function and composition. Nerves and neurons - Nerve impulses- Synapse- Reflex action- Reflex arc. - Notes on the eye. links to further study
An 8th grade lesson introductory lesson on the circulatory system ... in addition to the powerpoint I had the students take their pulse at rest at the beginning of class and then again during the middle of class after having them run in place for 30 seconds
The cardiovascular system can be thought of as the transport system of the body.
This system has three main components: the heart, the blood vessel and the blood itself.
The heart is the system’s pump and the blood vessels are like the delivery routes.
The presentation that will unable to create a clear cut concept regarding the Vessels the vascular system of the human body. It will let you know about the arteries, veins, capillaries how the exchange of nutrients and other substance takes place..and many more things related to the vessels of the body.
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Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
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Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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Lesson 3.1 The transport system
1.
2. The Transport System in Humans
•All cells in our body need nutrients, oxygen and water.
Meanwhile carbon dioxide and other waste materials
produces by the cells must be removed.
•An internal transport system is needed to deliver
useful materials to the body cells and remove the
waste materials from them.
•The internal transport system is often called the
circulatory system because useful as well as waste
materials circulate the body.
4. •A circulatory system has four basic characteristics:
a. Circulating fluid – this circulating fluid is called
blood. The blood transports useful and waste
materials.
b. Pumping device – the pumping device is the
heart. Blood is moved through the body by
muscular contractions of the heart.
c. Blood vessels – a complex network of blood
vessels carries materials to the tissues and back to
the heart. There are three main types of blood
vessels, namely arteries, veins and capillaries.
d. Valves – valves are present in some blood vessels
to prevent backflow and ensure that blood flows
in one direction only.
5. •The human circulatory system is a double
circulatory system. This means that in each
complete circuit of the body, the blood must flow
through the heart twice.
•The human double circulatory system consists of:
a. The pulmonary circulation which transports
blood between the heart and the lungs and
a. The systematic circulation which transports
blood between the heart and all other parts of
the body.
6. •The advantage of having a double circulatory system is that it
increase the pressure of the blood and the rate of flow, thereby
speeding up the delivery of materials to the tissues.
The human double circulatory system
7. Structure of the human heart
•An adult human heart is about the size of a clenches
fist.
•The heart lies in the chest between the two lungs.
•The heart is a muscular organ with walls made of
cardiac muscles.
•The coronary arteries supply nutrients and oxygen
wastes from the muscles.
•The heart is divided into four chambers. The two upper
chambers are called auricles and atria ( atrium) and the
two lower chambers are called ventricles.
8. •The septum divides the heart into the right and left
halves.
•The auricles have thinner walls than the ventricles.
When the auricles contract, blood is pushed into the
ventricles below.
•The left ventricle has a much thicker muscular wall
than the right ventricle. The right ventricle pumps blood
to the lungs , which lie next to the heart. The left
ventricle has to pump blood from the heart to the rest
of the body.
•The right atrium is connected to the right ventricle by
the tricuspid valve. The left atrium is connected to the
left ventricle by the bicuspid or mitral valve.
9. •Semilunar valves are
situated at the
entrances of the aorta
and the pulmonary
artery to prevent to
backflow of blood into
the ventricles.
• The chordae
tendineae prevent the
valves from turning
inside out when the
ventricles contract The structure of the human heart
10. Function of the human heart
•The heart is made up of two pumps located
side by side.
•The right side of the heart pumps
deoxygenated blood it receives from the lungs
to the rest of the body. Oxygen is removed at
the tissues for respiration
11. Arteries
a. Arteries are blood vessels which carry blood
away from the heart.
b. Arteries deliver oxygenated blood except
pulmonary artery.
c. The walls of the arteries are much thicker and
stronger than those of veins because they
have to withstand the high pressure of blood
coming from the heart.
The blood vessels
13. Veins
a. Veins are blood vessels which carry blood
back to the heart.
b. Veins deliver deoxygenated blood except
pulmonary veins.
c. Veins have thinner walls than arteries
because blood pressure in the veins is much
lower than that in the arteries. Since the
blood in the veins may be moving against
gravity, the contain valves to present the
blood from flowing back.
15. Capillaries
a. Capillaries are tiny blood vessels which
connect arteries and veins. They have walls
which are only one cell thick.
b. Oxygen and nutrients move from the blood
through the capillary walls into the body cells.
At the same time carbon dioxide and other
waste products move from the cells into the
body.
17. Characterist
ics
Artery Vein Capillary
Cross section Circular Oval Circular
Size of wall Has thick
muscular wall
Has thin
muscular wall
Has very thin
walls, only
one cell- thick
Valves Absent
(except in
pulmonary
artery)
Present Absent
Differences of artery, vein and
capillary
18. Lumen Narrow Fairly wide Very
narrow
Colour Red Bluish – red Bluish – red
Oxygen
content
Oxygenated
blood (except
in pulmonary
artery)
Deoxygenated
blood (except
in pulmonary
veins)
Oxygenated
blood to the
tissues
Deoxygenated
blood from
the tissues
19. •Heart disease is one of the major cause of death in
Thailand.
•Factors that increase the risk of getting heart disease:
a. Heredity – the risk is increase if there is a family
history of heart disease.
b. Cholesterol and obesity – high cholesterol and
obesity are major heart disease risk factor.
c. Lack of exercise – low level of physical activity
increase the risk of getting heart disease.
d. Smoking – smoking damages blood vessels and
leads to heart disease. Smoking also decreases the
amount of oxygen that reaches the heart.
21. e. Stress – people who are stressed are more prone to
heart attacks.
f. Alcohol – excessive alcohol intake can elevate blood
pressure, thus making heart attacks more likely.
Stress Alcohol
22. a. Avoid high cholesterol foods. Eat more fruits and
vegetables.
b. Regular aerobic exercises help to keep body weight
down. Lower blood pressure and strengthen the
heart.
c. Lose weight to a desirable weight range and keep
within it with moderate eating and exercise.
d. Relax and get enough sleep.
e. Quit smoking.
f. Reduce alcohol consumption.
23. Eat more fruits Aerobics Lose weight
Get enough sleep Quit Smoking Reduce Alcohol
