6.2 & D.4 The Heart and 6.4 & D.6 Gas Exchange

Which component of blood is used for oxygen transport?

• platelets

• plasma

• erythrocytes

• leukocytes

Which of the following is characteristic of veins?

• Carry blood at high pressure

• A wide lumen to keep pressure low and allow greater flow

• Narrower lumen surrounded by a thick wall of two layers

• Involved with material & gas exchange with surrounding tissue

All veins carry....

• blood away from the heart

• blood towards the heart

• oxygen-rich blood

• oxygen-poor blood

Which of the following carry blood away from the heart?

• veins

• venules

• capillaries

• arteries

Which of the following has the thickest wall?

• left ventricle

• right ventricle

• left atrium

• right atrium

Which node initiates contraction of the cardiac muscle?

• atrioventricular node

• sinoatrial node

• lymphnode

• athero node

Within the lungs, gas exchange occurs across the...

• trachea

• diaphragm

• alveoli

• bronchi

Which of the following is required in ALL living things in order for gas exchange to occur?

• gills

• lungs

• moist membranes

• blood

What muscles must relax when the external intercostal muscles contract?

• external intercostal muscles

• diaphragm

• internal intercostal muscles

• smooth muscle in bronchiole walls

The urge to exhale results from...

• rising pCO2

• falling pCO2

• rising pO2

• falling pO2