Exam 43: Muscles, Bones, and Body Movements

A ____ joint can move only in one direction, providing limited range of motion.

Synovial joints are held together by ____.

The human elbow is an example of a ____ joint.

Research indicates that compared to the genomes of bony fish, the elephant shark genome contains ____ the genes necessary for bone formation.

A ____ joint can move rotate about its axis, providing maximum range of motion.

The frozen contraction of muscle cells called rigor mortis occurs after death because ____.

In a(n) hydrostatic skeleton , the force of muscle contraction is applied against a rigid, external body covering.

A typical human body has ____ bones.

By _____, researchers had established how actin and myosin arrangements changed during muscle ____.

In skeletal muscle contraction, an increase in ____in the cytosol triggers the crossbridge cycle.

A motor unit is a ____.

Muscles that can be controlled precisely and delicately have few muscle fibers in each motor unit.

The main role of myoglobin in muscle fibers is to ____.

Skeletal muscle growth and development is inhibited by ____ produced in muscle cells.

When you collect a sand dollar on the beach, you are looking at the shell of an echinoderm consisting of ossicles formed from calcium carbonate crystals.

Thick filaments are parallel bundles of ____ molecules.

A rapid, powerful movement of short duration that could not be sustained very long would likely involve mainly ____.

Each motor unit is composed of ____.

Skeletal muscles are attached to bones by cords of connective tissue called tendons .

The primary source of new red blood cells in mammals is the ____.