Muscle Types and Intro to Cardiovascular

Flashcards covering key concepts related to muscle types and the cardiovascular system as per the lecture notes.

Skeletal Muscle Types

Muscle tissue that shares properties like striation and multi-nuclearity; includes fast twitch, slow twitch, and intermediate fibers.

Fast Twitch Fibers

Muscle fibers that contract rapidly, are light colored, large cells, use anaerobic metabolism, produce lactate quickly, and fatigue quickly.

Slow Twitch Fibers

Muscle fibers that are dark and small, resistant to fatigue, use aerobic metabolism, have high myoglobin and mitochondria.

Intermediate Fiber Types

Rare in primates, these fibers are fatigue resistant, generate moderate power, are dark, aerobic and utilize fat stores for energy.

Motor Unit Recruitment

The process of activating motor units where slow twitch units are activated first followed by fast twitch units as force requirements increase.

Pulmonary Circulation

The part of the cardiovascular system where blood travels from the right heart to the lungs and back to the left heart.

Systemic Circulation

The part of the cardiovascular system where blood circulates from the left heart to the body and returns to the right heart.

Cardiac Cycle

The sequence of events in the heart during one complete heartbeat, involving diastole and systole, with phases including isovolumetric contraction.

QRS Complex

The part of an EKG representing the depolarization of the ventricles during the cardiac cycle.

Isovolumetric Contraction

A phase of the cardiac cycle where the ventricles contract with no change in blood volume because the semilunar valves are closed.

Isovolumetric Relaxation

Phase in the cardiac cycle where the heart relaxes and pressure drops without a change in volume until the AV valve opens.