This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: When a cell membrane of an excitable cell is exposed to a depolarizing current, which of the ... (Read 99 times)

xroflmao

  • Hero Member
  • *****
  • Posts: 515
on: Jul 16, 2018
When a cell membrane of an excitable cell is exposed to a depolarizing current, which of the fol-lowing occurs?
 
  a. Increased influx of calcium into the cell
  b. Rapid influx of sodium ions into the cell
  c. Increased efflux of potassium out of the cell
  d. Rapid efflux of protein molecules out of the cell

Question 2

Phase 1 of a single-breath CO2 curve represents which of the following?
 
  a. Anatomic dead space
  b. Physiologic dead space
  c. Transition between airway and alveolar exhaled gas
  d. Anatomic shunt


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

stano32

  • Sr. Member
  • ****
  • Posts: 339
Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: B
An action potential begins when the cell membrane of the excitable cell is exposed to a depolar-izing current and eventually reaches its excitation threshold potential. The initial phase of this type of action potential consists of a rapid upstroke or depolarization. This change in membrane potential to a more positive value occurs because of a rapid influx of sodium ions into the cell.

Answer to Question 2

ANS: A
Anatomic dead space has no CO2; the mixed expired CO2 (FECO2) = 0 during that phase.


xroflmao

  • Member
  • Posts: 515
Reply 2 on: Jul 16, 2018
Excellent

anyusername12131

  • Member
  • Posts: 327
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

People about to have surgery must tell their health care providers about all supplements they take.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Bacterial cell division. Bacterial cell division.
Attachment of transmembrane proteins to the cytoskeleton and extracellular matrix of an animal cell. Attachment of transmembrane proteins to the cytoskeleton and extracellular matrix of an animal cell.
Graded membrane potentials. Graded membrane potentials.
Giardiasis. Colorized electron micrograph of a Giardia protozoan adhering to the surface of an epith Giardiasis. Colorized electron micrograph of a Giardia protozoan adhering to the surface of an epith
Human Cell Anatomy Human Cell Anatomy
The bacterial cell wall: (a) gram-positive bacterium; (b) gram-negative bacterium. The bacterial cell wall: (a) gram-positive bacterium; (b) gram-negative bacterium.
Video: Summary of glucose catabolism

For a complete list of videos, visit our video library