Question

place a single word into each sentence to make it correct.

1. systemic gas exchange is the unloading of (click to select) and loading of carbon dioxide.
2. this exchange occurs at the (click to select).
3. the oxygen remaining in the blood after it passes through the capillary bed provides a venous (click to select).
4. this is enough oxygen to (click to select) life for 4 - 5 minutes in the event of respiratory arrest.
5. alternately, carbon dioxide is loaded during an exchange called a (click to select) shift.

(click to select)
arteries
capillaries
chloride
den
yhydrogen
oxygen
reserve
sustain

Explanation:

1. Systemic gas exchange involves unloading oxygen (as it is delivered to tissues) and loading carbon dioxide (from tissues).
2. Gas exchange (both in systemic and pulmonary) occurs at capillaries (where thin - walled vessels allow for easy diffusion).
3. The oxygen remaining in blood after capillary bed passage is a venous reserve (a store of oxygen in veins).
4. The oxygen reserve can sustain (keep going) life for a short time in respiratory arrest.
5. Carbon dioxide loading during an exchange is called a chloride shift (a process in red blood cells).

Answer:

1. oxygen
2. capillaries
3. reserve
4. sustain
5. chloride