Question 1

What is the name of the bundles of elongated, cylindrical cells that make up skeletal muscles?

Accepted Answer

A) tendons 
B) muscle fibres 
C) sarcomeres 
D) myofibrils 
A) tendons 
B) muscle fibres 
C) sarcomeres 
D) myofibrils

Question 2

Match each molecule with its description.
-tropomyosin

Accepted Answer

A) molecules that form a twisted double helix that makes up most of the thin filaments 
B) neurotransmitters involved in muscle cell contraction 
C) molecules that block the crossbridge binding sites when the muscle is not contracting 
D) molecules that make up thick filaments 
E) molecules that bind to Ca2+, change their shape, and then uncover the crossbridge binding sites 
A) molecules that form a twisted double helix that makes up most of the thin filaments 
B) neurotransmitters involved in muscle cell contraction 
C) molecules that block the crossbridge binding sites when the muscle is not contracting 
D) molecules that make up thick filaments 
E) molecules that bind to Ca2+, change their shape, and then uncover the crossbridge binding sites

Question 3

What is the diameter of muscle fibers?

Accepted Answer

A) less than 5 micrometres 
B) 5 to 10 micrometres 
C) 10 to 100 micrometres 
D) more than 100 micrometres 
A) less than 5 micrometres 
B) 5 to 10 micrometres 
C) 10 to 100 micrometres 
D) more than 100 micrometres

Question 4

Why does the frozen contraction of muscle cells, called rigor mortis, occur after death?

Accepted Answer

A) because ions are not available in muscle cells 
B) because ATP production stops 
C) because neurotransmitters are no longer released 
D) because tropomyosin breaks down quickly 
A) because ions are not available in muscle cells 
B) because ATP production stops 
C) because neurotransmitters are no longer released 
D) because tropomyosin breaks down quickly

Question 5

Which term refers to a muscle that decreases the angle between two bones at a joint?

Accepted Answer

A) antagonist 
B) flexor 
C) extensor 
D) depressor 
A) antagonist 
B) flexor 
C) extensor 
D) depressor

Question 6

Which joints have bones joined by stiff fibres of connective tissue and are essentially immobile?

Accepted Answer

A) fibrous joints 
B) flexible joints 
C) cartilaginous joints 
D) synovial joints 
A) fibrous joints 
B) flexible joints 
C) cartilaginous joints 
D) synovial joints

Question 7

Match each characteristic with a muscle fibre type. Each muscle fibre type may be used once, more than once, or not at all.
-low oxidative phosphorylation capacity

Accepted Answer

A) slow 
B) fast aerobic 
C) fast anaerobic 
D) both slow and fast aerobic 
E) both fast aerobic and fast anaerobic 
A) slow 
B) fast aerobic 
C) fast anaerobic 
D) both slow and fast aerobic 
E) both fast aerobic and fast anaerobic

Question 8

Which fibers have a high myoglobin content?

Accepted Answer

A) fast muscle fibres and fast anaerobic muscle fibres 
B) slow muscle fibres and slow aerobic muscle fibres 
C) fast muscle fibres and fast aerobic muscle fibres 
D) slow muscle fibres and fast aerobic muscle fibres 
A) fast muscle fibres and fast anaerobic muscle fibres 
B) slow muscle fibres and slow aerobic muscle fibres 
C) fast muscle fibres and fast aerobic muscle fibres 
D) slow muscle fibres and fast aerobic muscle fibres

Question 9

How are synovial joints held together?

Accepted Answer

A) by sarcomeres 
B) by ligaments 
C) by muscle fibres 
D) by myofibrils 
A) by sarcomeres 
B) by ligaments 
C) by muscle fibres 
D) by myofibrils

Question 10

What kind of joint is the human elbow an example of?

Accepted Answer

A) a flexible joint 
B) a fibrous joint 
C) a cartilaginous joint 
D) a synovial joint 
A) a flexible joint 
B) a fibrous joint 
C) a cartilaginous joint 
D) a synovial joint

Question 11

Which skeletons are the ribs and sternum considered to be a part of?

Accepted Answer

A) the appendicular skeleton and the exoskeleton 
B) the axial skeleton and the appendicular skeleton 
C) the exoskeleton and axial skeleton 
D) the axial skeleton and the endoskeleton 
A) the appendicular skeleton and the exoskeleton 
B) the axial skeleton and the appendicular skeleton 
C) the exoskeleton and axial skeleton 
D) the axial skeleton and the endoskeleton

Exam 46: Muscles, Skeletons, and Body Movements

What is the name of the bundles of elongated, cylindrical cells that make up skeletal muscles?

Match each molecule with its description. -tropomyosin

What is the diameter of muscle fibers?

Why does the frozen contraction of muscle cells, called rigor mortis, occur after death?

Which term refers to a muscle that decreases the angle between two bones at a joint?

Which joints have bones joined by stiff fibres of connective tissue and are essentially immobile?

Match each characteristic with a muscle fibre type. Each muscle fibre type may be used once, more than once, or not at all. -low oxidative phosphorylation capacity

Which fibers have a high myoglobin content?

How are synovial joints held together?

What kind of joint is the human elbow an example of?

Which skeletons are the ribs and sternum considered to be a part of?

Light and Life

The Cell: an Overview

Defining Life and Its Origins

Energy and Enzymes

Cell Membranes and Signalling

Cellular Respiration

Photosynthesis

Cell Cycles

Genetic Recombination

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

Dna Structure, Replication, and Organization

Gene Structure and Expression

Control of Gene Expression

Dna Technologies

Genomes and Proteomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Species and Macroevolution

Understanding the History of Life on Earth

Humans and Evolution

Bacteria and Archaea

Viruses, Viroids, and Prions: Infectious Biological Particles

Protists

Fungi

Plants

Diversity of Animals 1: Sponges, Radiata, Platyhelminthes, and Protostomes

Diversity of Animals 2: Deuterostomes: Vertebrates and Their Closest Relatives

Population Ecology

Population Interactions and Community Ecology

Ecosystems

Conservation of Biodiversity

Putting Selection to Work

Organization of the Plant Body

Transport in Plants

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Transport in Animals: the Circulatory System

Reproduction in Animals

Animal Development

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Control

Control of Animal Processes: Neural Integration

Animal Behaviour

Animal Nutrition

Gas Exchange: the Respiratory System

Regulating the Internal Environment

Defences Against Disease

Conservation and Evolutionary Physiology

Filters