Question 1

In cardiac muscle

Accepted Answer

A)  potassium is released from the sarcoplasmic reticulum. 
B)  an action potential spreads throughout the Z discs. 
C)  intercalated discs connect the muscle fibers together. 
D)  calcium enters the cell from storage chambers called intercalated discs. 
A)  potassium is released from the sarcoplasmic reticulum. 
B)  an action potential spreads throughout the Z discs. 
C)  intercalated discs connect the muscle fibers together. 
D)  calcium enters the cell from storage chambers called intercalated discs.

Question 2

The T tubules that tunnel deep into a muscle fiber are formed from

Accepted Answer

A)  osteocytes. 
B)  plasma membrane. 
C)  blood proteins. 
D)  neurons. 
A)  osteocytes. 
B)  plasma membrane. 
C)  blood proteins. 
D)  neurons.

Question 3

The thick filaments of a myofibril are composed of

Accepted Answer

A)  actin. 
B)  T tubules. 
C)  myoglobin. 
D)  myosin. 
E)  sarcoplasm. 
A)  actin. 
B)  T tubules. 
C)  myoglobin. 
D)  myosin. 
E)  sarcoplasm.

Question 4

Which of the following attaches one bone to another bone at a joint?

Accepted Answer

A)  Cartilage 
B)  Callus 
C)  Ligament 
D)  Tendon 
A)  Cartilage 
B)  Callus 
C)  Ligament 
D)  Tendon

Question 5

In a hinge joint

Accepted Answer

A)  movement can occur only in two dimensions. 
B)  an extensor muscle rotates the bones. 
C)  motion occurs when gravity pulls on the insertion. 
D)  the flexor and the extensor must contract at the same time. 
E)  movement in three dimensions is possible. 
A)  movement can occur only in two dimensions. 
B)  an extensor muscle rotates the bones. 
C)  motion occurs when gravity pulls on the insertion. 
D)  the flexor and the extensor must contract at the same time. 
E)  movement in three dimensions is possible.

Question 6

The fluid in the sarcoplasmic reticulum contains a high concentration of ions, which are released by the stimulation of an action potential.

Accepted Answer

A)  iron 
B)  phosphorus 
C)  potassium 
D)  sodium 
E)  calcium 
A)  iron 
B)  phosphorus 
C)  potassium 
D)  sodium 
E)  calcium

Question 7

Protein bands that connect sarcomeres are called

Accepted Answer

A)  myofibrils. 
B)  troponins. 
C)  T tubules. 
D)  Z discs. 
A)  myofibrils. 
B)  troponins. 
C)  T tubules. 
D)  Z discs.

Question 8

Fast- twitch muscle fibers, such as those that predominate in the legs of sprinters, _ than slow- twitch fibers, which predominate in the legs of marathon runners.

Accepted Answer

A)  contain fewer mitochondria 
B)  contain higher levels of myoglobin 
C)  have a greater blood supply 
D)  produce more ATP 
A)  contain fewer mitochondria 
B)  contain higher levels of myoglobin 
C)  have a greater blood supply 
D)  produce more ATP

Question 9

When lifting a heavy object, the strength of leg muscle contractions is determined by the

Accepted Answer

A)  number of calcium ions released by the sarcoplasmic reticulum. 
B)  number of thick and thin filaments involved in each sarcomere during contraction. 
C)  amount of ATP used by each active sarcomere during muscle contraction. 
D)  frequency of action potentials and number of muscle fibers stimulated. 
A)  number of calcium ions released by the sarcoplasmic reticulum. 
B)  number of thick and thin filaments involved in each sarcomere during contraction. 
C)  amount of ATP used by each active sarcomere during muscle contraction. 
D)  frequency of action potentials and number of muscle fibers stimulated.

Question 10

Which of the following would be composed of smooth muscle?

Accepted Answer

A)  Muscles that allow you to cross your eyes 
B)  Muscles of the uterus 
C)  Quadriceps (leg muscle) 
D)  Ventricles of the heart 
A)  Muscles that allow you to cross your eyes 
B)  Muscles of the uterus 
C)  Quadriceps (leg muscle) 
D)  Ventricles of the heart

Exam 41: Action and Support: the Muscles and Skeleton

In cardiac muscle

The T tubules that tunnel deep into a muscle fiber are formed from

The thick filaments of a myofibril are composed of

Which of the following attaches one bone to another bone at a joint?

In a hinge joint

The fluid in the sarcoplasmic reticulum contains a high concentration of ions, which are released by the stimulation of an action potential.

Protein bands that connect sarcomeres are called

Fast- twitch muscle fibers, such as those that predominate in the legs of sprinters, _ than slow- twitch fibers, which predominate in the legs of marathon runners.

When lifting a heavy object, the strength of leg muscle contractions is determined by the

Which of the following would be composed of smooth muscle?

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity II: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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