Cell Communication Overview (Cell Signaling)

What is cell communication (or cell signaling)?

• The process by which cells detect, process, and respond to signals from their environment and other cells

• The process by which cells divide

• The process by which cells die

• The process by which cells move

Cells communicate through two broad mechanisms: 1. Direct Cell-to-Cell Contact (Physical Interaction) and 2. _________

• Chemical Signaling (Signal Molecules)

• Electrical Conduction (Nerve Impulses)

• Mechanical Vibration (Sound Waves)

• Thermal Radiation (Heat Transfer)

Which of the following does the mode of cell communication depend on?

• Distance between cells

• Urgency and type of response required

• Type of signaling molecules and receptors involved

• All of the above

Direct cell-to-cell contact occurs when cells physically touch each other to transmit signals. This is analogous to:

• Sending an email

• A face-to-face conversation

• Writing a letter

• Making a phone call

What is the role of antigen-presenting cells (APCs) in immune cell interactions?

• Act as scouts

• Act as attackers

• Act as barriers

• Act as messengers

Killer T-cells (Cytotoxic T-cells) make direct contact with infected or cancerous cells.

• True

• False

Fill in the blank: Killer T-cells deliver a _______ via perforins and granzymes.

• death signal

• growth factor

• nutrient

• hormone

The significance of direct contact in the immune system is:

• It allows immune cells to recognize and respond to infected or abnormal cells.

• It increases the production of red blood cells.

• It prevents the body from producing antibodies.

• It helps in the digestion of food.

Most cellular communication occurs through ________ messengers.

• chemical

• electrical

• thermal

• mechanical

A signaling cell releases molecules that bind to ________ on target cells, altering their behavior.

• receptors

• enzymes

• hormones

• organelles