BIOA02H3 Lecture Notes - Circulatory System, Extracellular Fluid, Pulmonary Artery

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26 Jun 2011

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49. 2 how have vertebrate circulatory systems evolved? www. notesolution. com vertebrates have closed circulatory systems and hearts with two or more chambers. In adult amphibians, the pulmonary and systemic circuits are partially separated. The heart has three chambers: a single ventricle pumps blood to the lungs and to the rest of the body, two atria receive blood returning to the heart. therefore, blood form both sides of the ventricle flows through both aortas to the systemic circuit. Birds and mammals have fully separated pulmonary and systemic circuits: separate circuits have several advantages for active animals with continuously high metabolic rates. oxygenated and deoxygenated blood cannot mix; therefore, the systemic circuit always receives blood with the higher oxygen content. respiratory gas exchange is maximized because the blood with the lowest oxygen content and highest co2 content is sent to the lungs.

Related Questions

Why is an open circulatory system less efficient than a closedcirculatory system?

A. Metabolic wastes cannot be removed from tissues in an opencirculatory system.

B. Blood cannot be used to transport nutrients in an opencirculatory system.

C. There is no heart to pump the blood in an open circulatorysystem.

D. Open circulatory systems lack respiratory pigments that bindto oxygen.

E. It is more difficult to quickly deliver O₂ tospecific tissues when needed with an open circulatory system.

greymosquito430

i)Why do multicellular animals need a circulatory system?
ii)Fluid pressure is very low in the veins. Explain how bloodgetsback to the heart.
iii) What do fat deposits in arteries cause and why isthisdangerous?

tanwater-buffalo567

1. The anatomic position refers to the position in which a person is standing upright facing the observer, feet parallel and flat on the floor, and palms facing forward.

True

False

2. The study of how gases are transferred between the lungs and blood, and between the blood and body tissues, best describes the focus of

cardiovascular physiology.

respiratory physiology.

nervous system anatomy.

reproductive anatomy.

3. Which level of organization in the human body involves two or more tissue types working together to perform specific, complex functions?

Tissue level

Cellular level

Organismal level

Organ level

4. A patient complaining of pain on his left side just deep to the ribs would be referring to which abdominopelvic quadrant?

Left upper

Right upper

Right lower

Left lower

5. Homeostasis is BEST described as

a process in which the external environment has no influence on the internal environment.

the changes in the internal environment which have no influence on health.

the maintenance of a stable internal environment despite a changing external environment.

the prevention of changes internally despite external changes.

ochrepanda878

BIOA02H3 Lecture Notes - Circulatory System, Extracellular Fluid, Pulmonary Artery

BIOA02H3 Full Course Notes

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