Ch 42 Continue

Question 1

Trace the path of an oxygen molecule from the atmosphere to the alveoli of the lungs

Answer 1

nasal cavity>glottis>larynx>tranchea>bronchi>bronchioles>alveoli

Question 2

How is oxygen transported in the blood to the cells of the body?

Answer 2

they bind to hemoglobin in erythrocytes (RBCs)

Question 3

How is carbon dioxide transported in the blood to the lungs?

Answer 3

it is primarily transported as Bicarbonate ions in the plasma

Question 4

Compare external respiration to internal respiration

Answer 4

• External respiration occurs between the pulmonary (alveolar) capillaries & the alveoli, CO2 leaves the blood when exhaling & O2 enters & binds to hemoglobin when inhaling
• Internal respiration occurs between the systemic capillaries & the cells & tissues of the body, oxygen leaves the systemic capillaries at the arteriole end of the capillaries & carbon dioxide enters at the venule end to be transported as bicarbonate ions in the plasma

Question 5

What is cellular respiration?

Answer 5

Oxygen enters the mitochondria of the cells for the complete oxidation of glucose to ATP+Carbon Dioxide+water

Question 6

What is the function of the Medullary Respiratory Center?

Answer 6

You have control over breathing to a point. PCO2 increases when you hold your breath, as a response the Aorta & Carotid bodies in the blood will send signals to the Medullary Respiratory Center to trigger ventilation

Question 7

Describe how air enters the alveoli when we inhale

Answer 7

diaphragm contracts & moved down & your intercostal muscles contract & pull the ribs up & out creating negative pressure in the lungs, which pulls in air