When a platelet contacts a damaged blood vessel, it is stimulated to release thromboxane A₂. Thromboxane A₂ in turn stimulates vascular spasm and attracts additional platelets to the injured site. In this example, thromboxane A₂ is acting as a __________.

Which of the following actions correctly describe a role performed by at least one type of intercellular connection? Select True or False for each statement.

T/FAllows communication between adjacent cells.

T/FForms a watertight barrier between the cells.

T/FUses components of the extracellular matrix to indirectly connect adjacent cells.

T/FAssociates with cytoskeletal components to resist pulling forces.

Paracrine signaling is characterized by signaling molecules (ligands) that are _______:

Cortisol is a stress hormone created by the adrenal glands which can affect many tissues throughout the body. How is cortisol able to reach target cells that are far from the adrenal glands?

Which of the following types of signaling is represented in the figure?