Question 1

Which cell does NOT have a nucleus in humans?

Accepted Answer

A) erythrocytes 
B) lymphocytes 
C) neutrophils 
D) eosinophils 
E) macrophages 
A) erythrocytes 
B) lymphocytes 
C) neutrophils 
D) eosinophils 
E) macrophages

Question 2

The receiving region of a vertebrate heart is

Accepted Answer

A) the superior vena cava. 
B) the aorta. 
C) the atrium. 
D) the capillary bed. 
E) all of these. 
A) the superior vena cava. 
B) the aorta. 
C) the atrium. 
D) the capillary bed. 
E) all of these.

Question 3

The aorta leaves the

Accepted Answer

A) left atrium. 
B) right atrium. 
C) left ventricle. 
D) right ventricle. 
E) pulmonary trunk. 
A) left atrium. 
B) right atrium. 
C) left ventricle. 
D) right ventricle. 
E) pulmonary trunk.

Question 4

A narrowing of the coronary arteries may

Accepted Answer

A) be treated by balloon angioplasty 
B) cause a heart attack. 
C) be treated by coronary bypass surgery. 
D) be treated by laser 
E) include all of these. 
A) be treated by balloon angioplasty 
B) cause a heart attack. 
C) be treated by coronary bypass surgery. 
D) be treated by laser 
E) include all of these.

Question 5

Which of the following statements is false?

Accepted Answer

A) Veins lack smooth muscle and elastic fibers. 
B) Parasympathetic nervous system stimulation decreases heart rate. 
C) Adjustments to blood flow result from stimuli from the nervous and endocrine systems and from changes in local chemicals. 
D) Thrombin is an enzyme that acts on fibrinogen. 
E) Hemostasis stops bleeding. 
A) Veins lack smooth muscle and elastic fibers. 
B) Parasympathetic nervous system stimulation decreases heart rate. 
C) Adjustments to blood flow result from stimuli from the nervous and endocrine systems and from changes in local chemicals. 
D) Thrombin is an enzyme that acts on fibrinogen. 
E) Hemostasis stops bleeding.

Question 6

The part of the brain responsible for blood pressure regulation is the

Accepted Answer

A) medulla oblongata. 
B) cerebellum. 
C) cerebrum. 
D) corpus callosum. 
E) pons. 
A) medulla oblongata. 
B) cerebellum. 
C) cerebrum. 
D) corpus callosum. 
E) pons.

Question 7

Which of the following releases substances that initiate blood clotting?

Accepted Answer

A) lymphocytes 
B) basophils 
C) erythrocytes 
D) neutrophils 
E) platelets 
A) lymphocytes 
B) basophils 
C) erythrocytes 
D) neutrophils 
E) platelets

Question 8

Which of the following is an advantage of the bird and mammalian circulatory system?

Accepted Answer

A) It is closed. 
B) It is fully divided into two circuits. 
C) There is no mixing of oxygen-poor and oxygenated blood. 
D) Blood is directly pumped out to body capillaries after oxygenation in the lungs. 
E) All of these are an advantage. 
A) It is closed. 
B) It is fully divided into two circuits. 
C) There is no mixing of oxygen-poor and oxygenated blood. 
D) Blood is directly pumped out to body capillaries after oxygenation in the lungs. 
E) All of these are an advantage.

Question 9

Cholesterol dissolved in the blood is carried by

Accepted Answer

A) albumin. 
B) high-density lipoproteins. 
C) low-density lipoproteins. 
D) triglycerides. 
E) both high-density and low-density lipoproteins. 
A) albumin. 
B) high-density lipoproteins. 
C) low-density lipoproteins. 
D) triglycerides. 
E) both high-density and low-density lipoproteins.

Question 10

Plasma normally amounts to what percent of the total blood volume?

Accepted Answer

A) 15 to 25 
B) 33 to 40 
C) 50 to 60 
D) 66 to 75 
E) about 80 
A) 15 to 25 
B) 33 to 40 
C) 50 to 60 
D) 66 to 75 
E) about 80

Question 11

Megakaryocytes fragment to produce

Accepted Answer

A) red blood cells. 
B) lymphocytes. 
C) platelets. 
D) eosinophils. 
E) neutrophils. 
A) red blood cells. 
B) lymphocytes. 
C) platelets. 
D) eosinophils. 
E) neutrophils.

Question 12

The human heart

Accepted Answer

A) contracts as a result of stimuli from the sinoatrial node. 
B) contracts only as a result of nerve stimulation from the central nervous system. 
C) is activated primarily through the autonomic nervous system. 
D) rate is primarily under the control of the atrioventricular node. 
E) is independent of all nervous control. 
A) contracts as a result of stimuli from the sinoatrial node. 
B) contracts only as a result of nerve stimulation from the central nervous system. 
C) is activated primarily through the autonomic nervous system. 
D) rate is primarily under the control of the atrioventricular node. 
E) is independent of all nervous control.

Question 13

Which of the following assist(s) in venous return to the heart?

Accepted Answer

A) valves that prevent backflow 
B) vasoconstriction during exercise 
C) contraction of skeletal muscles alongside veins 
D) pressure changes in the thorax during breathing 
E) all of these 
A) valves that prevent backflow 
B) vasoconstriction during exercise 
C) contraction of skeletal muscles alongside veins 
D) pressure changes in the thorax during breathing 
E) all of these

Question 14

The most dangerous type of arrhythmia is

Accepted Answer

A) tachycardia. 
B) ventricular fibrillation. 
C) brachycardia. 
D) atrial fibrillation. 
E) an electrocardiogram. 
A) tachycardia. 
B) ventricular fibrillation. 
C) brachycardia. 
D) atrial fibrillation. 
E) an electrocardiogram.

Question 15

What occurs during systole?

Accepted Answer

A) Oxygenated blood is pumped to the lungs. 
B) The heart muscle tissues contract. 
C) The atrioventricular valves suddenly open. 
D) Oxygen-poor blood from all body regions except the lungs flows into the right atrium. 
E) All of these occur. 
A) Oxygenated blood is pumped to the lungs. 
B) The heart muscle tissues contract. 
C) The atrioventricular valves suddenly open. 
D) Oxygen-poor blood from all body regions except the lungs flows into the right atrium. 
E) All of these occur.

Question 16

Cardiac muscle cells

Accepted Answer

A) do not contract by a sliding filament mechanism. 
B) are similar to those of smooth muscle in being nonstriated. 
C) have fewer mitochondria than skeletal muscle cells do. 
D) possess numerous gap junctions on their sides, favoring rapid spread of excitation. 
E) have intercalated disks with tight junctions at their branching ends. 
A) do not contract by a sliding filament mechanism. 
B) are similar to those of smooth muscle in being nonstriated. 
C) have fewer mitochondria than skeletal muscle cells do. 
D) possess numerous gap junctions on their sides, favoring rapid spread of excitation. 
E) have intercalated disks with tight junctions at their branching ends.

Exam 37: Circulation

Which cell does NOT have a nucleus in humans?

The receiving region of a vertebrate heart is

The aorta leaves the

A narrowing of the coronary arteries may

Which of the following statements is false?

The part of the brain responsible for blood pressure regulation is the

Which of the following releases substances that initiate blood clotting?

Which of the following is an advantage of the bird and mammalian circulatory system?

Cholesterol dissolved in the blood is carried by

Plasma normally amounts to what percent of the total blood volume?

Megakaryocytes fragment to produce

The human heart

Which of the following assist(s) in venous return to the heart?

The most dangerous type of arrhythmia is

What occurs during systole?

Cardiac muscle cells

Invitation to Biology

Lifes Chemical Basis

Molecules of Life

Cell Structure and Function

A Closer Look at Cell Membranes

Ground Rules of Metabolism

Where It Startsphotosynthesis

Energy-Releasing Pathways

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Dna Structure and Function

From Dna to Protein

Controls Over Genes

Recombinant Dna and Genetic Engineering

The Macroevolutionary Puzzle

Emergence of Evolutionary Thought

Organizing Information About Species

The Origin and Evolution of Life

Viruses and Prokaryotes

Protists the Simplest Eukaryotes

Plants

Fungi

Animals: the Invertebrates

Animal Evolution the Chordates

Human Evolution: a Case Study

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction

Plant Growth and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Protection, Support, and Movement

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Population Ecology

Community Structure and Biodiversity

Ecosystems

The Biosphere

Human Impacts on the Biosphere

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