1) At what point is the amount of oxygen at its highest? in the capillaries duri

Question

1) At what point is the amount of oxygen at its highest?

in the capillaries during strenous activity

in the lungs

in the capillaries at rest

in muscle tissue during strenous activity

2) You have diagnosed a patient with an iron deficiency. The most likely result of this is

low carbon dioxide content

very red blood

low oxygen content

high oxygen content

3) Why are insects limited to relatively small sizes?

Their respiratory system relies on diffusion which is slow over long distances

Their respiratory muscles are smooth muscle only

They have a closed circulatory system

Their exoskeleton cannot support larger-bodied animals

4) Air rushes into the lungs of humans during inhalation because

the volume of the thoracic cavity increases

pressure in the alveoli increases

the diaphragm contracts and pushes upward on the chest cavity

smooth muscle lining the trachea and bronchi contracts and causes their volume to increase

in the capillaries during strenous activity

in the lungs

in the capillaries at rest

in muscle tissue during strenous activity

Explanation / Answer

1. At the lungs

2. low oxygen content. Iron is essential for formation of hemoglobin which carreis oxygen in the blood. Lack of iron leads to anemia, and thus to oxygen deficiency.

3. Their respiratory system relies on diffusion which is slow over long distances ( In insects, gas exchange with air is mediated directly to the tissues by a highly branched system of chitin-lined tubes called tracheae, so the the need to allow enough oxygen to reach the tissue by diffusion imposes limits on tracheal length)

4- The volume of thoracic cavity increases

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