Bio 335 Exam 3 Study Guide (1

Bio 335 Exam 3 Study Guide
Atrioventricular valves shut when ___.

A) Pressure of the right atrium exceeds pressure right ventricle
B) Pressure of the right ventricle exceeds pressure right atrium

✅✅-B) Pressure of
C) Pressure of the left atrium exceeds pressure left ventricle
D) Pressure of the left ventricle exceeds pressure right atrium -
the right ventricle exceeds pressure right atrium

Which of the following is associated with coordinating the difference between atrial
and ventricular contraction?

A) Gap junction proteins that link muscle fibers in intercalated discs
B) Delayed depolarization of the A-V node

✅✅
C) Large size of ventricular muscles
D) Rapid depolarization of the S-A node - -B) Delayed depolarization of the A-V
node

Blood pressure is higher in ___ due to ___.

A) legs, kinetic energy and vasoconstriction
B) legs, the fluid column effects and gravity

✅✅-B) legs, the fluid
C) head, the fluid column effect and gravity
D) head, the high energetic requirements of the brain -
column effects and gravity

Which of the following is not associated with promoting venous return?

A) high pressure
B) low resistance to blood flow

✅✅
C) contractions of skeletal muscle
D) passive one-way valves - -A) high pressure

Blood flow through the liver is 750 mL/min, the arterial oxygen content is 0.25 mL
O2/mL blood, and the venous oxygen content is 0.20 mL O2/mL blood, the rate of
O2 consumption by the liver is ___ mL of oxygen per minute.

A) 187.5
B) 150

✅✅-D) 37.5
C) 15000
D) 37.5 -

, In the diving beetle example, the concentration of oxygen inside of the bubble is 7.5
mmol/L and the partial pressure is 0.18 atm. In the surrounding water, the
concentration of oxygen is 0.3 mmol/L and the partial pressure is 0.21 atm. Which is
most likely to occur?

A) Oxygen will flow in both directions
B) Oxygen will flow from the bubble into the water

✅✅
C) Oxygen will flow from the water into the bubble
D) Oxygen will not flow - -C) Oxygen will flow from the water into the bubble

Oxygen enters the mitochondria ___.

A) by diffusion, at a rate that is dependent on the flow of the oxygenated capillary
blood
B) by convection, at a rate that is dependent on the difference in O2 partial pressure
between the blood systemic capillaries and the mitochondria
C) by diffusion, at a rate that is dependent on the difference in O2 partial pressure
between the blood systemic capillaries and the mitochondria

✅✅
D) by convection, at a rate that is dependent on the flow of the oxygenated capillary
blood - -C) by diffusion, at a rate that is dependent on the difference in O2
partial pressure between the blood systemic capillaries and the mitochondria

Which statement is the most accurate definition of external respiration?

A) The process by which O2 is transported to the gas-exchange membrane from the
environmental medium and by which CO2 is transported away from the membrane
into the environmental medium
B) The process by which CO2 is transported to the gas-exchange membrane from
the environmental medium and O2 is transported away from the membrane into the
environmental medium
C) Diffusion of O2 and CO2 across the gas exchange membrane

✅✅
D) Bulk flow (convection) of air or water to and from the gas-exchange membrane -
-A) The process by which O2 is transported to the gas-exchange membrane
from the environmental medium and by which CO2 is transported away from the
membrane into the environmental medium

The volume of air in the lungs following a complete exhalation of the expiratory
reserve volume is

A) one-half the inspiratory reserve volume
B) called the residual volume

✅✅
C) called the tidal volume
D) very close to 0 mL - -B) Called the residual volume