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BIOL 140 Humans And The Environment

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  • Course Code: BIOL 140
  • University: University Of Pennsylvania
  • Country: United States



a.Using a red and blue coloured pencil colour in the diagram above indicate the nature of blood present in each side of the heart.

b.Label the structures identified by the arrows above.

c.Produce a table that identifies the functions of these structures in maintaining effective circulation.

d.Under separate headings, with reference to the structures identified with a star explain the roles of these in terms of blood flow into and out of the heart.

Completed forms to be made available for external moderation.


In a table, COMPARE the structure and functions of arteries, veins and capillaries, with reference to the following:

  • Function
  • Structure of wall
  • Size of lumen
  • Presence of valves
  • How structure fits function.

Completed forms to be made available for external moderation.


Your heart is a single organ, but it acts as a double pump in the human body – Explain this important concept.

Completed forms to be made available for external moderation.


The cardiac conduction system is a group of specialized cardiac muscle cells in the walls of the heart that send signals to the heart muscle causing it to contract.

a.In your own words, explain the term myogenic.

b.Outline the main components (tissues) of the system and their role in creating a signal that stimulates contraction of the muscles of the heart to create a heartbeat in the cardiac cycle.

c.When clinicians listen to the heart, they hear a distinct “lub dub” sound. Describe the causes of these sounds.


A clinician recorded the blood pressure of a 46 year old male patient. The results are recorded below.

a.Explain the significance of the upper and lower figures in these recordings.

b.Compare the average recording with the “normal range” ( ie; the value that you would expect of someone of this age/gender etc). Discuss this patients’ state of health with regard to the results above and briefly discuss the factors that may cause blood pressure to fluctuate over time.


a.Explain the changes that would occur in the concentration of blood gases and blood pressure in response to exercise and how heart rate and stroke volume adapt to these changes.

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