Differentiate Between Preload and Afterload,and Select the Correct Statement

question 1

Multiple Choice

Differentiate between preload and afterload,and select the correct statement.

• A) Preload is the force (force of ventricular contraction) that the heart must generate in order to overcome vascular resistance (open the aortic valve) and eject blood out of the left ventricle. Afterload is the amount of blood returning to the heart (venous return).
• B) Preload is the force (force of atrial contraction) that the heart must generate in order to overcome vascular resistance (open the mitral valve) and eject blood out of the left ventricle.
• C) Preload is the amount of blood returning to the heart (venous return). Afterload is the force (force of ventricular contraction) that the heart must generate in order to overcome vascular resistance (open the aortic valve) and eject blood out of the left ventricle.
• D) None of these are correct.

---

Definitions:

Bedrock

The solid rock layer beneath soil, loose rocks, or other surface materials.

Sea Cave

A cave at the base of a sea cliff, usually flooded by seawater.

Erosion Promontory

A high point of land that extends into a body of water, formed from the resistance of its materials to weathering and erosion.

Seafloor Spreading

The process by which new oceanic crust is created at mid-ocean ridges and gradually moves away from the ridge, contributing to continental drift.