Do Type II Alveolar Cells Allow Rapid Diffusion?

-Type II alveolar cells secrete surfactant. –

Elastin fibers allow the alveoli to stretch thin enough for diffusion

to occur. -They are made of a single layer of simple squamous epithelium and elastin fibers allow the alveoli to stretch thin enough for diffusion to occur.

Do type 2 alveolar cells allow rapid diffusion of gases?

Transcribed image text: Type II alveolar cells allow rapid diffusion of

gases through their thin membranes

, secrete a chemical known as surfactant, and are phagocytic. allow rapid diffusion of gases through their thin membranes.

What alveolar cells allow rapid diffusion?

Explanation: The vast majority of the surface area of an alveolus is made up of

type 1 alveolar cells

, which are squamous (flat), thin epithelial cells that allow rapid gas exchange between the air inside the alveoli and blood in the surrounding capillaries.

What do type 2 alveolar cells do?

Four major functions have been attributed to alveolar type II cells: (1)

synthesis and secretion of surfactant

; (2) xenobiotic metabolism; (3) transepithelial movement of water; and (4) regeneration of the alveolar epithelium following lung injury.

What cells allow for rapid gas diffusion?

Alveolar cells

that allow rapid diffusion of respiratory gases.

Are type 2 alveolar cells phagocytic?

Two types are pneumocytes or pneumonocytes known as type I and type II cells found in the alveolar wall, and a large phagocytic cell known as an

alveolar macrophage

that moves about in the lumens of the alveoli, and in the connective tissue between them.

Which features of the alveolar sacs allows for the ease of diffusion of gasses?

-Elastin fibers allow the alveoli to

stretch thin enough

for diffusion to occur. -They are made of a single layer of simple squamous epithelium and elastin fibers allow the alveoli to stretch thin enough for diffusion to occur.

What type of alveolar cell produces surfactant?

The pulmonary surfactant is produced by

the alveolar type-II (AT-II) cells

of the lungs. It is essential for efficient exchange of gases and for maintaining the structural integrity of alveoli. Surfactant is a secretory product, composed of lipids and proteins.

What would happen if the type 2 alveolar cells were damaged it would contribute to?

Damage to type II cells results in

decreased production of surfactant with resultant decreased compliance and alveolar collapse

. Interference with the normal repair processes in the lung may lead to the development of fibrosis.

What is the function of type I alveolar cells in the alveolar walls quizlet?

the cells that form the alveolar wall and those that form the capillary wall. … broad, simple squamous epithelial cells that make up the majority of the cells lining the walls of the alveoli. type 1 alveolar cell function.

single cell layer for easy diffusion of gases across the respiratory membrane

.

What is the difference between type1 and type 2 alveolar cells?

The key difference between type 1 and type 2 pneumocytes is that

type 1 pneumocytes are thin and flattened alveolar cells

that are responsible for the gas exchange between alveoli and capillaries, while type 2 pneumocytes are cuboidal alveolar cells that are responsible for the secretion of pulmonary surfactants that …

Why does diffusion across the respiratory membrane proceed very rapidly?

Diffusion across the respiratory membrane is very rapid because

the distance is small and the gases (oxygen and carbon dioxide) are lipid soluble

.

Which of the following is a function of surfactant by type II alveolar cells?

Alveolar type II cells secrete a lipoprotein material called surfactant, whose primary function is to

reduce the surface tension in the alveoli

. Surfactant is a lipoprotein that consists mainly of dipalmitoylphosphatidylcholine and some glycoprotein components.

What cell type within an alveolus is part of the respiratory membrane?

What diffuses from the alveolar sacs into the blood in the capillaries?

The oxygen you breathe in

diffuses through the alveoli and the capillaries into the blood. The carbon dioxide you breathe out is diffused from the capillaries to the alveoli, up the bronchial tree and out your mouth.

How do respiratory gases move in and out of the Type 1 alveolar cell?

At the respiratory membrane, where the alveolar and capillary walls meet, gases move across the membranes,

with oxygen entering the bloodstream and carbon dioxide exiting

. It is through this mechanism that blood is oxygenated and carbon dioxide, the waste product of cellular respiration, is removed from the body.

What type of alveolar cells produce surfactant quizlet?

Surfactant is a complex substance containing phospholipids and a number of apoproteins. This fluid is produced by the

Type II alveolar cells

, and lines the alveoli and smallest bronchioles.

When alveolar pressure is equal to atmospheric pressure air flows into the lungs?

During quiet expiration, the cycle is reversed, the inspiratory muscles relax and the inward elastic recoil of the lungs results in deflation of the lungs. During deflation, the lungs and chest wall move as one unit. Airflow out of the lungs ceases when alveolar pressure equals atmospheric pressure (

0 cm H2O

).

Which is the order of airflow during inhalation?

When you inhale through your nose or mouth, air travels down the pharynx (back of the throat),

passes through your larynx (voice box) and into your trachea (windpipe)

. Your trachea is divided into 2 air passages called bronchial tubes. One bronchial tube leads to the left lung, the other to the right lung.

How does alveoli facilitate gas exchange?

The walls of the alveoli share a membrane with the capillaries. That’s how close they are. This lets

oxygen and carbon dioxide diffuse

, or move freely, between the respiratory system and the bloodstream. Oxygen molecules attach to red blood cells, which travel back to the heart.

What would be the effect of having stratified epithelium in the alveoli?

If alveolar tissue were made of stratified epithelium as opposed to simple squamous epithelium, then

diffusion of oxygen would decrease

.

What primarily determines airway resistance in the airways?

1. What primarily determines airway resistance in the respiratory passageways? …

The partial pressure gradient of oxygen determines the

direction of the movement of this respiratory gas.

Which of the following reduces alveolar surface tension?

Surfactant

. Surfactant is a complex mixture of phospholipids and surfactant proteins that reduces alveolar surface tension.

What is surfactant in respiration?

Introduction. Pulmonary surfactant is

a mixture of lipids and proteins which is secreted into the alveolar space by epithelial type II cells

. The main function of surfactant is to lower the surface tension at the air/liquid interface within the alveoli of the lung.

Which factor is most important for determining the resistance to air flow in the respiratory system?

One of the most important factors influencing airway resistance is

the diameter of the airway

. In general, the opposition of flow can be described as the pressure divided by the rate of flow (R = change in P/V). However, factors such as turbulent or laminar flow also impact the resistance to flow in the lungs.

What function do the alveolar sacs serve in the respiratory system?

Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and

the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out

.

What is the function of type two alveolar cells quizlet?

Type II alveolar cells

secrete surfactant

.

Which tissue functions for diffusion of respiratory gases quizlet?

The

type I pneumocytes of alveoli and the walls of the capillaries

form the respiratory membrane which permits the diffusion of gases between air in the alveoli and blood in the capillaries.

What effect does surfactant have on airflow?

It is established that pulmonary surfactant

reduces surface tension at the air

–water interface in the alveoli, thereby preventing collapse of these structures at end-expiration. In this manner, surfactant reduces the work associated with breathing.

What structural features of alveoli facilitate gas exchange?

• they give the lungs a really big surface area.
• they have moist, thin walls (just one cell thick)
• they have a lot of tiny blood vessels called capillaries.

What is the function of type I alveolar cells in the alveolar walls What is the function of type I alveolar cells in the alveolar walls?

Typically, type 1 alveolar cells comprise

the major gas exchange surface of the alveolus

and are integral to the maintenance of the permeability barrier function of the alveolar membrane. Type 2 pneumocytes are the progenitors of type 1 cells and are responsible for surfactant production and homeostasis.

What is the purpose of type 2 alveolar cells?

Four major functions have been attributed to alveolar type II cells: (1)

synthesis and secretion of surfactant

; (2) xenobiotic metabolism; (3) transepithelial movement of water; and (4) regeneration of the alveolar epithelium following lung injury.

What do type I and type II alveolar cells do?

The type I cell is a complex branched cell with multiple cytoplasmic plates that are greatly attenuated and relatively devoid of organelles; these plates represent the gas exchange surface in the alveolus. On the other hand, the type II cell

acts as the “caretaker” of the alveolar compartment

.

What is the function of surfactant secreted by type II pneumocytes found in the alveoli?

Surfactant is a mixture of phospholipids and proteins secreted by type II pneumocytes that

reduces surface tension and prevents alveoli from collapsing at the end of expiration

.

Why does diffusion across the respiratory membrane proceed very rapidly quizlet?

The upper respiratory system consists of the nose, nasal cavity, paranasal sinuses, and ________. … The anterior portion of the nasal septum is formed of ________.

Which statement accurately describes alveolar and systemic gas exchange?

Which statement accurately describes alveolar and systemic gas exchanges?

In alveolar gas exchange oxygen diffuses into the blood, but in systemic gas exchange it diffuses out of the blood.

When there is no air movement the relationship between the intrapulmonary and atmospheric pressure is that?

Question: When there is no air movement, the relationship between the intrapulmonary and atmospheric pressure is that: a.

atmospheric pressure is less than intrapulmonary.

Are type 2 alveolar cells phagocytic?

Two types are pneumocytes or pneumonocytes known as type I and type II cells found in the alveolar wall, and a large phagocytic cell known as an

alveolar macrophage

that moves about in the lumens of the alveoli, and in the connective tissue between them.

What cells make up the respiratory membrane?

The respiratory membrane includes the

alveolar epithelial cells as well as the pulmonary capillary endothelial cells

and fused basal laminae between alveolar and epithelial cells. The respiratory membrane is where gas exchange takes place. 2.

What type of alveolar cell produces surfactant?

The pulmonary surfactant is produced by

the alveolar type-II (AT-II) cells

of the lungs. It is essential for efficient exchange of gases and for maintaining the structural integrity of alveoli. Surfactant is a secretory product, composed of lipids and proteins.