BIO120 Unit 3 Flashcardizz

Front

What type of channel randomly opens and closes?

Back

Leak channels are ion channels that randomly open and close, allowing ions to flow across the membrane without a specific trigger.

Front

What happens to the Z lines during a sarcomere contraction?

Back

During a sarcomere contraction, the Z lines get closer together, indicating that the muscle is shortening.

Front

What type of contraction occurs when an athlete lowers weights?

Back

Isotonic eccentric contraction occurs when the muscle lengthens while under tension, such as when lowering weights.

Front

What is an isometric contraction?

Back

An isometric contraction is when the muscle generates tension without changing its length, resulting in no movement.

Front

What type of muscle tissue is cardiac muscle?

Back

Cardiac muscle tissue is striated and involuntary, meaning it has a striped appearance and operates without conscious control.

Front

Define mechanical channels in muscle physiology.

Back

Mechanical channels are ion channels that open in response to physical deformation of the cell membrane, such as stretching.

Front

What is the role of voltage-gated channels?

Back

Voltage-gated channels open or close in response to changes in membrane potential, playing a crucial role in action potentials.

Front

Explain the sodium-potassium pump's function.

Back

The sodium-potassium pump actively transports sodium out of the cell and potassium into the cell, maintaining the resting membrane potential.

Front

What is the difference between isotonic and isometric contractions?

Back

Isotonic contractions involve muscle shortening or lengthening with movement, while isometric contractions involve tension without movement.

Front

What are striated muscles?

Back

Striated muscles have a banded appearance due to the arrangement of actin and myosin filaments, found in skeletal and cardiac muscles.