Intercalated Disks Are Cell-Cell Junctions Found Between Cardiac Muscle Cells

question 25

Multiple Choice

Intercalated disks are cell-cell junctions found between cardiac muscle cells.A feature of intercalated disks is a large number of gap junctions.This means

• A)an extension of smooth endoplasmic reticulum goes through the gap junction,making it continuous from one cardiac muscle cell to the next.
• B)water and small ions can readily pass from one cardiac muscle cell to the next.
• C)the plasma membrane encompasses multiple cardiac muscle cells.
• D)RNA from one cardiac muscle cell can be transported into an adjacent cell through the gap junction.

---

Definitions:

Demographic Transition

A model that describes the transformation of countries from having high birth and death rates to low birth and death rates as part of economic development.

Carrying Capacity

The maximum population size of a species that an environment can sustain indefinitely, given the food, habitat, water, and other resources available.

Sustainable Supply

The procurement and supply of goods and services in a manner that balances environmental, social, and economic demands to meet the needs of the present without compromising the ability of future generations to meet their own needs.

Type II Survivorship

A survivorship curve where individuals die at a constant rate across their lifespan, common in some birds and perennial plants.