Author

Adriana Valenzuela

At a commercial fitness center in Lahaina, Hawaii, Adriana Valenzuela, NASM-CPT, NSCA-CSCS, trains clients with an emphasis on functional anatomy. After monitoring gym floors during college kinesiology studies, Valenzuela developed a routine of explaining muscle actions to clients mid-workout, balancing coaching with winter trips Nordic skiing on groomed forest trails.

What Is an Oxygen Debt and How Is It Repaid?
What Is Excitation-Contraction Coupling?
Myofibrils: Structure, Function, and Muscle Contraction
What Is a Sarcolemma and What Does It Do?
What Is Functional Anatomy? A Movement-Based Approach
How Is Muscle Built: Inside the Biology of Growth
The Gas Exchange Model and How It Works
Sarcolemma vs. Sarcoplasmic Reticulum: Key Differences
Why Do Skeletal Muscles Have So Many Nuclei?
What Are Muscle Cells and How Do They Work?
What Is the Sarcoplasmic Reticulum and What Does It Do?
What Are the Body Planes and Why Do They Matter?
What Is the Difference Between Collagen and Elastin?
How Are Muscle Cells Different From Other Cells?
Myocyte Structure: A Look Inside Our Body’s Muscle Cells
What Are Physiological Factors and Why Do They Matter?
Where does diffusion occur in the body?
How Does the Nervous System Work With the Muscular System?
Muscle Sex: The Biological Differences in Male & Female Muscle
What Are the 3 Energy Systems in the Body?
What Is Internal Balance: How Your Body Stays Stable
What Is the Functional Contractile Unit of the Myofibril?
Do Muscles Secrete Hormones? The Science of Myokines
What Causes Muscle Tone? The Physiology Explained
Does the M Line Shorten During Contraction?
How Many Sarcomeres Are in a Muscle Cell?
What Initiates an Action Potential on a Muscle Cell?
How Big Can a Human Get? The Limits of Size
In What Plane Does Abduction Occur?
Why Do Slow Twitch Muscles Have More Mitochondria?