Lamarck Believed

question 14

Multiple Choice

Lamarck believed

• A) that a substance called fluida moved through the nerves to areas of the body in need of change.
• B) in the inheritance of acquired characteristics.
• C) that giraffes' necks elongated in response to stretching.
• D) that environmental pressures bring about changes in organisms.
• E) all of these were true.

---

Definitions:

SA Node

The sinoatrial node, a group of cells in the right atrium of the heart that initiates the heartbeat, acting as the natural pacemaker.

AV Node

The atrioventricular node, a part of the heart's electrical system that regulates the timing of electrical impulses passing from the atria to the ventricles.

Cardiac Conduction

The process by which the heart's electrical system transmits signals, initiating heartbeats and ensuring the heart beats in a coordinated manner.

Sinoatrial Node

A small body of specialized muscle tissue in the heart that acts as a natural pacemaker, initiating the heart's electrical impulses.