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After the threshold membrane potential is reached and an action potential is initiated, voltage-gated Na+ (sodium) ion channels open. What happens next?

Which of the following is not a member of the four quadriceps femoris muscles?

What is the correct term for when the myosin heads are bound to the active site on actin during the contraction phase of skeletal muscle contraction?

Which of the following is the part of a sarcomere where the thick and thin filaments overlap?

During digestion of food, the smooth muscle in your digestive organs contract in a unique way to create rhythmic waves that push food particles through the GI tract. What is this called?

There are two neurons involved in a neuron-neuron synapse. Which neuron is responsible for sending the message from its axon terminal to the next neuron?

True or False: At rest, the inside of an axon is more negative than the outside.

True or False: The light band of a striation is caused by the A bands of a sarcomere.

The latissimus dorsi is a large back muscle that originates from the iliac crest, thoracic vertebrae, and lumbar vertebrae. It inserts as a tendon into the proximal humerus. Which of the following are functions of the latissimus dorsi?

True or False: Dendrites and cell bodies can generate an action potential.