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Hemoglobin, Heart Placement, CPR, ECG

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Blood

Describe the structure of hemoglobin.

How does the structure of hemoglobin allow it to combine to oxygen?

Cardiovascular

Discuss the size, position, and location of the heart in the thoracic cavity.

How is CPR accomplished? What is the significance of the placement of the heart in the thoracic cavity and successful CPR?

What does a electrocardiogram measure and record? List the normal ECG deflection waves and intervals. What do the various ECG waves represent?

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Hemoglobin, heart Placement, CPR, and ECGs are explained in this solution.

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Describe the structure of hemoglobin. How does the structure of hemoglobin allow it to combine to oxygen?

Hemoglobin is an oxygen-carrying protein made up of four polypeptide subunits. The interaction of these four subunits gives hemoglobin "quaternary" structure. Specifically, it is made up of two "beta" chains and two "alpha" chains. These are called "globins." Each chain has a "heme" structure embedded in it which binds the oxygen molecule. The heme plus the globins is what makes up the "hemoglobin." Heme is a very complex organic compound with an iron atom in the middle of a fairly flat structure. The iron atom is Fe2+. Heme is a pigment that is not protein. The iron coordinates with oxygen to keep it bond to hemoglobin. Therefore, there are four hemes in one hemoglobin.

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Discuss the size, position, and location of the heart in the thoracic cavity.

The heart is a cone-shaped organ that is about the size of the individual's closed fist. It averages only about 300 grams in mass. It contains four chambers, two atria and two ventricles. It sits on the diaphragm near the middle of the thoracic cavity in what is called the mediastinum. This is a broad median partition between the ...

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