Which of the following is the smallest unit of contractile tissue in cardiac and skeletal muscle cells?

All of the following features are unique to cardiac muscle cells except:

Which of the following molecules binds to troponin during muscle contraction, triggering tropomyosin to move away from the actin binding sites and allowing the myosin head to form a cross bridge?

During contraction, the A band of the sarcomere does which of the following?

The individual unit of muscle contraction in a muscle fibril is referred to as the __________.

In the sliding filament theory of muscle contraction, all but which of the following are functions of ATP?

Which is the only muscle type that is non-striated?

The muscle body is encased in which of the following?

The sliding filament theory of muscle contraction involves the __________ attaching to __________ and then pulling during the power stroke.

Which of the following is the name of the modified endoplasmic reticulum found in muscle cells?