Human Physiology: Four Organ Systems

In the mouth, ____ begins starch digestion into maltose.

• Salivary amylase
• Pepsin
• Trypsin
• Lipase

Which enzyme digests proteins into peptones in the stomach?

• Amylase
• Lipase
• Pepsin
• Bile

What finger-like projections increase absorption surface area?

• Alveoli
• Villi
• Nephrons
• Neurons

Who described the circulatory system in 1628?

• Robert Hooke
• William Harvey
• Charles Darwin
• Louis Pasteur

How many chambers does the human heart have?

• Four
• Three
• Two
• Five

The SA node is the natural pacemaker of the heart.

• True
• False

Oxygenated blood is pumped to the body through the ____.

• Aorta
• Pulmonary artery
• Trachea
• Vena cava

Where does gas exchange occur in the lungs?

• Larynx
• Trachea
• Alveoli
• Bronchi

Oxygen binds hemoglobin to form what compound?

• Bicarbonate
• Oxyhemoglobin
• Peptone
• Maltose

Respiration is regulated by the cerebrum of the brain.

• True
• False

The basic unit of the nervous system is the ____.

• Platelet
• Alveolus
• Neuron
• Villus

Which brain part controls balance and coordination?

• Spinal cord
• Cerebellum
• Cerebrum
• Medulla

Signals cross gaps between neurons called what?

• Valves
• Synapses
• Villi
• Alveoli

Reflex actions are processed through the spinal cord.

• True
• False

Which blood cells carry hemoglobin?

• Red blood cells
• Plasma
• White blood cells
• Platelets