Chapter 9 (Muscles and Muscle Tissue) Review

Which of the following is/are functions of muscles (select all that apply):

• Produce movement

• Remove nitrogen waste from the blood

• Help maintain body position and posture

• Stabilize joints

• Generate heat through contraction

A slide of muscle tissue is viewed under a light microscope. It is found to have multiple striations, and you are told that it was initially attached to the humerus. What type of muscle tissue would this be classified as:

• Cardiac muscle

• Smooth muscle

• Skeletal muscle

• All of the above

What type of muscle tissue would be MOST LIKELY found in the walls of hollowed organs such as the stomach, bladder, or blood vessels?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• None of the above

Which of the following statements is TRUE:

• Cardiac muscle cells have no nuclei.

• Smooth muscle cells have T tubules.

• Skeletal muscle cells are long and cylindrical with multiple nuclei and T tubules.

• Cardiac muscle cells are found only in blood vessels and near bones.

The attachment site of a muscle to the MOVEABLE bone is known as the INSERTION site, while the muscle attachment site to the IMMOVEABLE bone is known as ORIGIN.

• True

• False

What structure in skeletal muscle cells functions in calcium storage?

• Sarcoplasmic reticulum

• Mitochondria

• Intermediate filament network

• Myofibrillar network

Myoglobin:

• breaks down glycogen.

• is a protein involved in the direct phosphorylation of ADP.

• is a protein that stores oxygen in muscle cells.

• releases neurotransmitters at the end of an axon.

The muscle fiber plasma membrane is known as the:

• Sarcoplasmic reticulum

• Sarcoplasm

• Sarcolemma

• Sarcomere

The smallest contractile unit (functional unit) of a muscle fiber is known as a:

• Nephron

• Sarcomere

• Sarcolemma

• Myofibril

The THICK protein myofilament is known as:

• Actin

• Myosin

• Troponin

• Tropomyosin