AP Biology Human Physiology

Heart rate will increase in the presence of increased

• epinephrine.
• immuno-globulins
• low-density lipoproteins.
• platelets.

At an atmospheric pressure of 870 mm Hg of 21% oxygen, the partial pressure of oxygen is

• 100 mm Hg.
• 182 mm Hg.

Blood returning to the mammalian heart in a pulmonary vein drains first into the

• right atrium.
• left atrium.
• vena cava.

Which structure is responsible for water absorption and production of Vitamin K?

• epiglottis
• Stomach
• Large intestine
• Small intestine

Which structure is a 'trapdoor' that prevents food from entering the trachea?

• epiglottis
• esophagus
• pharynx
• appendix

Which structure makes bile?

• Stomach
• Pancreas
• Liver
• mouth

Where does chemical digestion begin?

• Mouth
• esophagus
• stomach
• small intestine

Where does absorption of food occur in the digestive system?

• small intestine
• large intestine
• stomach
• epiglottis

____________ is when smooth muscles contract to gently move food through the alimentary canal.  It begins with swallowing.

• bolus
• peristalsis
• ulcer
• amylase

What is secreted in the stomach to kill bacteria?

• amylase
• Hydrochloric acid
• Sodium bicarbonate
• bile