Question 1

In cardiac muscle:

Accepted Answer

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

Question 2

If you break your leg, the bone heals by forming a thickened area around the outside of the bone. Over a period of time, this thickened area:

Accepted Answer

A) is eaten away by osteoclasts. 
B) becomes a permanent part of the spongy bone. 
C) is digested by enzymes secreted by the muscles. 
D) forms new tendons, ligaments, and/or muscles. 
E) moves to the skin surface and is shed as dead skin. 
A) is eaten away by osteoclasts. 
B) becomes a permanent part of the spongy bone. 
C) is digested by enzymes secreted by the muscles. 
D) forms new tendons, ligaments, and/or muscles. 
E) moves to the skin surface and is shed as dead skin.

Question 3

What type of cell is found in cartilage?

Accepted Answer

The answer of What type of cell is found in...

Question 4

Bones store:

Accepted Answer

A) magnesium. 
B) amino acids. 
C) glycogen. 
D) phosphorus. 
E) manganese. 
A) magnesium. 
B) amino acids. 
C) glycogen. 
D) phosphorus. 
E) manganese.

Question 5

Skeletal muscle:

Accepted Answer

A) makes up the heart. 
B) squeezes food through the digestive tract. 
C) contracts the large blood vessels. 
D) moves the body. 
E) expands the large blood vessels. 
A) makes up the heart. 
B) squeezes food through the digestive tract. 
C) contracts the large blood vessels. 
D) moves the body. 
E) expands the large blood vessels.

Question 6

When a muscle fiber receives an action potential from a neuron, how many sarcomeres in the fiber contract?

Accepted Answer

A) a number directly proportional to the strength of the stimulus 
B) a number inversely proportional to the strength of the stimulus 
C) all of them 
D) none of them 
A) a number directly proportional to the strength of the stimulus 
B) a number inversely proportional to the strength of the stimulus 
C) all of them 
D) none of them

Question 7

Smooth muscle:

Accepted Answer

A) contracts when stretched. 
B) produces fast contractions. 
C) does not contain actin or myosin. 
D) is under voluntary control. 
A) contracts when stretched. 
B) produces fast contractions. 
C) does not contain actin or myosin. 
D) is under voluntary control.

Question 8

Skeletal muscle appears striped because of:

Accepted Answer

A) T tubules. 
B) accessory proteins in thin filaments. 
C) the arrangement of thick and thin filaments. 
D) wrapping of sarcoplasmic reticulum around the myofibril. 
E) the arrangement of ions on each side of the sarcoplasmic reticulum. 
A) T tubules. 
B) accessory proteins in thin filaments. 
C) the arrangement of thick and thin filaments. 
D) wrapping of sarcoplasmic reticulum around the myofibril. 
E) the arrangement of ions on each side of the sarcoplasmic reticulum.

Question 9

Which of the following people has the greatest bone density?

Accepted Answer

A) a person who has been chronically ill and in bed 
B) a professional bodybuilder 
C) an astronaut who has been in space for an extended time 
D) a computer programmer 
A) a person who has been chronically ill and in bed 
B) a professional bodybuilder 
C) an astronaut who has been in space for an extended time 
D) a computer programmer

Question 10

The ion ________ is found in high concentrations in the sarcoplasmic reticulum.

Accepted Answer

The answer of The ion ________ is found in high...

Question 11

List the steps in the process by which a bone heals.

Accepted Answer

A clot forms, osteoclasts eat

Question 12

The binding site where calcium binds to a protein and activates skeletal muscle contraction is:

Accepted Answer

A) myosin. 
B) actin. 
C) troponin. 
D) tropomyosin. 
A) myosin. 
B) actin. 
C) troponin. 
D) tropomyosin.

Question 13

A joint that is movable in only two dimensions is called a(n)________ joint.

Accepted Answer

The answer of A joint that is movable in only...

Question 14

Some joints are immobile and do not allow the two bones involved to move. True or False?

Accepted Answer

A) True 
 B)False

Question 15

The hard exoskeleton of a crustacean:

Accepted Answer

A) encases, individually, each of the animal's vital organs. 
B) provides a substitute for muscles. 
C) necessitates periodic molting to permit growth. 
D) is entirely different from the exoskeleton of an insect. 
A) encases, individually, each of the animal's vital organs. 
B) provides a substitute for muscles. 
C) necessitates periodic molting to permit growth. 
D) is entirely different from the exoskeleton of an insect.

Question 16

A muscle fiber generates maximum contractile force when:

Accepted Answer

A) it has been stretched excessively. 
B) some of the myofibrils contract and then relax at the same time. 
C) it receives repeated action potentials from a nerve. 
D) it has been exposed to creatine phosphate. 
A) it has been stretched excessively. 
B) some of the myofibrils contract and then relax at the same time. 
C) it receives repeated action potentials from a nerve. 
D) it has been exposed to creatine phosphate.

Question 17

Describe some important functions of muscles and skeletons.

Accepted Answer

Muscles and skeletons both enable an org

Question 18

What would happen to a person who was poisoned with a chemical that blocks the production of neurotransmitters at neuromuscular junctions?

Accepted Answer

A) The person's muscles would contract uncontrollably. 
B) The sarcoplasmic reticulum would release its stores of calcium ions. 
C) The muscles would be unable to contract. 
D) The muscles would enlarge. 
A) The person's muscles would contract uncontrollably. 
B) The sarcoplasmic reticulum would release its stores of calcium ions. 
C) The muscles would be unable to contract. 
D) The muscles would enlarge.

Question 19

________ is/are found in both smooth and cardiac muscles.

Accepted Answer

A) Gap junctions 
B) Sarcoplasmic reticulum 
C) A regular arrangement of sarcomeres 
D) Desmosomes 
A) Gap junctions 
B) Sarcoplasmic reticulum 
C) A regular arrangement of sarcomeres 
D) Desmosomes

Question 20

________ is part of the thick filaments; ________ is part of the thin filaments.

Accepted Answer

A) Actin; myosin 
B) Myosin; actin 
C) Z lines; T tubules 
D) T tubules; Z lines 
A) Actin; myosin 
B) Myosin; actin 
C) Z lines; T tubules 
D) T tubules; Z lines

Exam 40: Action and Support: the Muscles and Skeleton

In cardiac muscle:

If you break your leg, the bone heals by forming a thickened area around the outside of the bone. Over a period of time, this thickened area:

What type of cell is found in cartilage?

Bones store:

Skeletal muscle:

When a muscle fiber receives an action potential from a neuron, how many sarcomeres in the fiber contract?

Smooth muscle:

Skeletal muscle appears striped because of:

Which of the following people has the greatest bone density?

The ion ________ is found in high concentrations in the sarcoplasmic reticulum.

List the steps in the process by which a bone heals.

The binding site where calcium binds to a protein and activates skeletal muscle contraction is:

A joint that is movable in only two dimensions is called a(n)________ joint.

Some joints are immobile and do not allow the two bones involved to move. True or False?

The hard exoskeleton of a crustacean:

A muscle fiber generates maximum contractile force when:

Describe some important functions of muscles and skeletons.

What would happen to a person who was poisoned with a chemical that blocks the production of neurotransmitters at neuromuscular junctions?

________ is/are found in both smooth and cardiac muscles.

________ is part of the thick filaments; ________ is part of the thin filaments.

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

The Continuity of Life: Cellular 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 Amidst 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

How Do Ecosystems Work

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

Filters

is part of the thick filaments; is part of the thin filaments.