Cardiorespiratory Performance (Human Biology III)

Study the heart and lungs to learn about the cardiorespiratory system in the human body. Investigate the biological processes that drive breathing, gas exchange and blood flow in the human body.

Course Code: BSC301
Fee Code: S2
Duration (approx) Duration (approx) 100 hours
Qualification Statement of Attainment
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DEVELOP YOUR CARDIORESPIRATORY KNOWLEDGE

This course is ideal for students with a biological science background, and is also an excellent addition to a Certificate or higher level course in health and biology fields.
  • Enrol and commence studying anytime
  • Work at your own pace and focus on things of greater interest to you.
  • Great tutors , highly qualified, and with years of experience stand ready to support you every step of the way

Students will cover a variety of related topics in order to learn how the cardiovascular and respiratory systems function cooperatively to keep the body alive.  Monitoring and regulatory mechanisms governing cardiorespiratory functions are investigated, along with the physical laws and biochemical processes that explain how and why the cardiorespiratory system works in the way it does.  From gas exchange, cellular energy production, cardiomyocyte contraction, alveolar structure and function, gas laws, blood physiology and cellular oxygen demand, students will develop a sound understanding of breathing and blood flow.

Lesson Structure

There are 7 lessons in this course:

  1. The Science of Blood
  2. Blood Pressure
  3. Pulmonary Ventilation
  4. Gas Exchange & Transport
  5. Blood Flow & Gas Transport
  6. Cardio Respiratory Control
  7. Cardio Respiratory Disease

Each lesson culminates in an assignment which is submitted to the school, marked by the school's tutors and returned to you with any relevant suggestions, comments, and if necessary, extra reading.

What You Will Do

  • Apply physical formulas to explain movement of gases in the body
  • Understand the cellular need for oxygen
  • Investigate removal of carbon dioxide from the body
  • Learn the importance of carbon dioxide in blood chemistry
  • Understand how cells produce energy aerobically and anaerobically, and how the body cardiorespiratory system deals with the waste products of these processes
  • Develop their understanding of homeostasis and equilibrium, diffusion and osmosis and the importance of each to gas exhange
  • Test concepts practically using common household items
  • Analyse data from basic experiments to develop their knowledge of lesson topics
  • Examine the role of fitness and exercise in cardiorespiratory health and function
  • Interpret electrocardiograms
  • Discover the impact of different conditions, illnesses and disease processes on cardiorespiratory performance

How is Heart Muscle Cell Activity Controlled?

The electrical control of the heart occurs via the sinoatrial node, the atrioventricular node, the bundle of His and.

Sinoatrial Node (SA Node)

The sinoatrial node is found right at the top of the wall of the right atrium, near where the superior vena cava enters.  It is composed of modified cardiomyocytes that do not contract but transit electrical impulses much more rapidly than normal cardiomyocytes.  The cells of the sinoatrial node initiate the action potential that triggers cardiac muscle contraction.  It triggers action potentials without influence from the nervous system; however, the rate and strength of contractions are influenced by feedback from the nervous system and brain.  The sinoatrial node is essential the hearts natural pacemaker.  How often the cells of the sinoatrial node depolarise and trigger an action potential determines how often your heart will beat. 

The electrical impulses (action potentials) from the sinoatrial node trigger co-ordinated contraction of both atria by causing depolarisation of the cardiomyocytes in that area.  The impulse travels on to the atrioventricular node.


Atrioventricular Node (AV Node)

The atrioventricular node is found on the bottom wall of the right atrium, along the wall of cardiac tissue that divides the two atria.  It is also comprised of modified, non-contractile cardiomyocytes.  Its function is to hold up the electrical impulse from the sinoatrial node.  This provides a delay that allows the atria to fully contract before the cardiomyocytes of the ventricles are stimulated to contract.  This ensures that the ventricles are full of blood before they contract.  The electrical impulse then travels on to the bundle of His, also known as the atrioventricular bundle.  When the sinoatrial node is damaged, the atrioventricular node can take over as the primary pacemaker for the heart.


Bundle of His (Atrioventricular bundle)

The bundle of His is located immediately inferior to the AV node; in the wall (septum) that divides the ventricles.  It branches as it travels down the septum and functions to provide very rapid transmission of the electrical impulse from the AV node to the Purkinje fibres.  This function is due to the bundle also being composed of the modified non-contractile cardiomyocytes.


Purkinje Fibres

These are the terminal end of the electrical conduction system of the heart.  They run from the base of the septum up and around the outer walls of both ventricles.  Like the rest of the conduction system, they are made up of modified cardiomyocytes.  (The term fibre here refers to muscle fibres, or cells, not to nerve fibres). 

It is the cells of the Purkinje fibres that deliver the electrical impulse that originated in the SA node to the ventricular cardiomyocytes, causing a co-ordinated contraction of both ventricles.

 

 

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Course Contributors

The following academics were involved in the development and/or updating of this course.

Jade Sciascia

Biologist, Business Coordinator, Government Environmental Dept, Secondary School teacher (Biology); Recruitment Consultant, Senior Supervisor in Youth Welfare, Horse Riding Instructor (part-completed) and Boarding Kennel Manager.
Jade has a B.Sc.Biol, Di

Lyn Quirk

M.Prof.Ed.; Adv.Dip.Compl.Med (Naturopathy); Adv.Dip.Sports Therapy
Over 30 years as Health Club Manager, Fitness Professional, Teacher, Coach and Business manager in health, fitness and leisure industries. As business owner and former department head fo

Karen Lee

Nutritional Scientist, Dietician, Teacher and Author.
BSc. Hons. (Biological Sciences), Postgraduate Diploma Nutrition and Dietetics.
Registered dietitian in the UK, with over 15 years working in the NHS. Karen has undertaken a number of research projec





Tutors

Meet some of the tutors that guide the students through this course.

Kerry Claydon

BA-BSc (Psychology, Computer Science, Aquaculture), BSc (Hons Microbiology), PhD (Microbiology), Diploma in Brewing Science

Kerry has over 20 years’ experience in various fields of microbiology including aquatic microbiology, medical microbiology, agricultural microbiology, and brewing microbiology. Kerry has been the Director of several health programs within Australian and Asia and is a passionate teacher and tutor

Timothy Walker

B.A.(Botany), RHS.M. Hort., Post.Grad.Dip.Ed.

Timothy is a Botanist, Horticulturist and Gardener. He is an Author, and also a lecturer at Somerville College, Oxford. After training at a number of gardens including Windsor Great Park and the Royal Botanic Gardens, Kew, Timothy commenced work at Oxford Botanic Gardens in 1986. Appointed as "Horti Praefectus" (Superintendent/Director) there in 1988, he held that position until 2014. Under Timothy's watch, the garden won four gold medals at the Chelsea Flower Show, and developed 67 acres of MG5 wild flower meadow at the Harcourt Arboretum; a UK threatened habitat. Timothy remains an active practical gardener as well as a highly respected international academic in the fields of horticulture and plant botany.

Nicola Stewart

BA(Hons); Dip.Pub; CIM Dip.Marketing; PGCE; Dip.Holistic Aromatherapy; Dip.Reflexology; Dip.Orton-Gillingham Multisensory Language Education; Masters in Education & Professional Studies/Research, PhD (underway)

Nicola worked in publishing before changing direction to teach Anatomy, Physiology and various complementary therapies in the UK’s post-compulsory sector for 16 years. She is the published author of 10 books, plus a range of magazine articles and has also ghost-written across a number of genres. When she is not working for ACS, she provides specialist literacy tuition for children with dyslexia.

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