Exam 43: Muscles, Bones, and Body Movements

Tube feet of sea stars, erectile tissue of the penis in vertebrates, and the bodies of cnidarians are all supported by ____.

Myoglobin content is high in ____.

Describe the process by which botulinum toxin interrupts the crossbridge cycle. Provide other possible uses for this toxin.

The human finger contains ____ joints.

The radius and ulna are considered to be part of ____.

The Z lines in skeletal muscle are composed of ____.

The bodies of arthropods are supported mainly by ____.

Figure 43.9 -Answer the question using the accompanying figure. The muscle indicated by the letter 'B' is analogous to the ____ muscle in a human.

A muscle that decreases the angle between two bones at a joint is called a(n)____.

Individual skeletal muscle cells are packed with cylindrical contractile elements about 1 mm in diameter called ____.

Figure 43.9 -Answer the question using the accompanying figure. The muscle indicated by the letter 'A' is a(n) ____ muscle.

A single, weak contraction of a muscle fiber is called ____.

In skeletal muscle contraction, when ____ binds to Ca²⁺, it undergoes a conformational change that allows tropomyosin to move to the grooves in the actin double helix.

For humans and most vertebrates, the body is supported primarily by ____.

Bone plays a critical role in providing ____ for the blood.

The striated muscles in most invertebrates have thick and thin filaments arranged in sarcomeres entirely similar to those of vertebrates.

Annelids must utilize ____ muscles in order to move.

Bone tissue is composed of ____ and ____ regions.

Which muscle type is found in the walls of body tubes and cavities of vertebrates, such as blood vessels and the intestines?

Figure 43.3 -Answer the question using the accompanying figure. The structure labeled "B" forms at the ____.