Which of the following is true regarding muscle cell specialization?

I. Contraction is controlled by the presence or absence of calcium ions

II. Actin filaments are known as the "thick" filaments

III. Contraction is an ATP-independent process

IV. The basic functional unit of muscle contraction is called the sarcoplasmic reticulum

Which of the following is true regarding muscle cell specialization?

I. Contraction is controlled by the presence or absence of calcium ions

II. Actin filaments are known as the "thick" filaments

III. Contraction is an ATP-independent process

IV. The basic functional unit of muscle contraction is called the sarcoplasmic reticulum

Neurons transmit signals via transmission of an electrical signal called an action potential. Which integral membrane protein is crucial for the rising phase of an action potential?

Neurons transmit signals via transmission of an electrical signal called an action potential. Which integral membrane protein is crucial for the rising phase of an action potential?

Which of the following statements about cardiac muscle is not true?

Which of the following statements about cardiac muscle is not true?

In synaptic transmission, the __________ of the pre-synaptic cell can make either a chemical or electrical synapse with a __________ of the post-synaptic cell.

In synaptic transmission, the __________ of the pre-synaptic cell can make either a chemical or electrical synapse with a __________ of the post-synaptic cell.