BIO120 Unit 3 Flashcardizz

Front

What is the only voluntary muscle type?

Back

Skeletal muscle is the only voluntary muscle type, meaning it is under conscious control.

Front

What are the extensions of the sarcolemma that carry the muscle impulse deep into the core of a muscle cell?

Back

Transverse Tubules (T-tubules) are extensions of the sarcolemma that help transmit the muscle impulse into the muscle cell.

Front

What does the H-Zone represent in a sarcomere?

Back

The H-Zone is the region in a sarcomere that contains only thick filaments (myosin) and is visible during muscle contraction.

Front

Where are neurotransmitters located in a neuron?

Back

Neurotransmitters are located at the axon terminals of a neuron, where they are released into the synaptic cleft.

Front

What type of neurotransmitters allow Chloride ions in or potassium ions out?

Back

Inhibitory neurotransmitters allow Chloride ions in or potassium ions out, producing an Inhibitory Postsynaptic Potential (IPSP) in the postsynaptic neuron.

Front

What is the function of skeletal muscle?

Back

Skeletal muscle is responsible for voluntary movements of the body, such as walking, running, and lifting.

Front

What is the role of the sarcoplasmic reticulum in muscle cells?

Back

The sarcoplasmic reticulum stores calcium ions and releases them during muscle contraction.

Front

What is the difference between EPSP and IPSP?

Back

EPSP (Excitatory Postsynaptic Potential) depolarizes the postsynaptic membrane, while IPSP (Inhibitory Postsynaptic Potential) hyperpolarizes it.

Front

What is the structure of a sarcomere?

Back

A sarcomere is the basic contractile unit of muscle tissue, composed of thick (myosin) and thin (actin) filaments.

Front

What is the role of myofibrils in muscle contraction?

Back

Myofibrils are the contractile elements of muscle fibers, containing the sarcomeres that shorten during contraction.