Which of the following is a function of the nasal cavities in humans?
filter, warm, humidify, sanple for odor
What name is given to the sheet of muscle that helps move air in and out of the lungs?
Within the lungs, gas exchange occurs across
The ________is a passageway shared by both food and air.
Why do cigarette smokers cough more than nonsmokers?
The respiratory systems attempts to clean mucus no longer moved by cilia
Inhalation in humans is achieved by
The rib cage expands as muscle between the ribs contract
When you are breathing normally, exhalation results mainly from
relaxation of rib muscles and the diapragm
Compared to the vital capacity, how much air can lungs actually hold?
more than the vital capacity because there is always a left over portion of oxygen
When you hold your breath, which of the following blood gas changes leads initially to the urge to breathe again?
increase in CO2 levels of blood and pH drops
What part of the human brain contains the primary breathing control center?
medulla oblangata and pons
Medullary breathing centers directly sense and respond to
the pH of the blood
Oxygen moves from blood into the interstitial fluid and then to body cells because
it diffuses from a region of higher partial pressure to lower partial pressure
Oxygen is mostly transported through the body
Most C02 is transported to the lungs
What prompts a newborn baby to start to breathe?
the blood pH level falls due to a build up of CO2
Which of the following statements regarding circulatory systems is true?
it transports oxygen and CO2, distributes nutrients to cells, and conveys waste products of metabolism for disposal
Which of the following is a function of the circulatory system?
Carry oxygen from lungs to tissues and carbon dioxide from tissues to lungs there by aiding in the exchange of gases. Supply of oxygen is needed for proper functioning of the cells. Removal of carbon dioxide is also equally essentials it becomes toxic to cells when present in high amount.
The two basic types of circulatory systems that have evolved over time are
open and closed
Which of the following animals has a single circuit of blood flow and two heart chambers?
Which of the following animals has a three-chambered heart?
frogs, crocodiles, turtles, lizards, snakes
In mammals, blood returning from the head will pass through the________ just before entering the right atrium.
superior vena cava
In mammals, which of the following vessels transports oxygenated blood from the lung back to the heart?
Oxygen-poor blood is carried from the heart of a mammal to the lungs via the
Blood is pumped from the heart to the lungs by the
From the left ventricle, oxygen-rich blood flows through the
The largest blood vessel in the human body is the
During which phase of the heartbeat does the heart fill with blood?
The location of the heart's pacemaker is a specialized region of cardiac muscle called the
SA (sinotrial) node
The main function of the AV node is to
relay and contract signals from a pacemaker, and delay the signal 0.1 seconds so the atria have contracted and emitted
Myocardial infarction, also called a heart attack,
is the damage/death of cardia muscle tissue because blood vessels from the heart get clogged
Which of the following is the cause of 40% of all deaths in the United States?
Arteries are distinguished from veins based on the following features
thicker connective tissue, higher blood pressure, and no valves present
Which blood vessels have the thinnest walls?
In humans, which blood vessels have valves?
Which of the following can contribute to high blood pressure?
cholesterol, genetics, smoking, alcohol, obesity, salt, and a lack of excercise
The diameter of a capillary is about the same as that of
a red blood cell
The liquid part of blood is called
Cells make up about what percentage of total blood volume?
How long do human red blood cells circulate in the blood before they wear out and have to be replaced?
An adult human's red blood cells are formed in the
The voice box is defined as?
A tube dorsal to the trachea is?
The smallest conducting passageways in the lungs are?
The air sacs within the lungs are?
The heart chamber with the thickest wall is the?
Heart chamber that contains the sinoatrial node
The four pulmonary veins return oxygenated blood to this chamber