Uptake and Fate of Nanoparticles

Practice flashcards covering key concepts about the uptake and fate of nanoparticles in the human body.

What are nanoparticles?

Natural or synthetic objects with dimensions in the sub-micrometer range.

How do humans get exposed to nanoparticles?

Through everyday activities such as using personal care products and inhaling air pollutants.

What can nanoparticles cross in the human body?

Natural protective barriers such as the lung epithelium and blood brain barrier.

What is the size range for nanoparticles?

Sub-micrometer range, specifically less than 100 nm.

In what forms can nanoparticles be produced?

They can be formed from one or more materials.

What is the mucociliary escalator?

A clearance mechanism in the tracheobronchial region that helps remove deposited particles.

What is phagocytosis?

A process where macrophages engulf and digest larger particles.

What are two major pathways for particle clearance from the lungs?

Mucociliary escalator and phagocytosis by macrophages.

What is the significance of the lung’s size-dependent deposition?

The smaller the particulate matter (PM), the deeper it penetrates into the lung.

What percentage of inhaled PM stays in the lung?

Approximately 1% of inhaled PM is not exhaled and remains in the lung.

What is the average intake of titanium dioxide for children under 10 years?

1-2 mg TiO2 per kilogram body weight per day.

What are common sources of nanoparticles in everyday life?

Tobacco smoke, air pollution, and products containing engineered nanoparticles.

What is the peak size range of nanoparticles in tobacco smoke?

Around 150 nm.

What impacts does tobacco smoke have on blood pressure?

Reduces levels of the enzyme monoamine oxidase (MAO) by 33%-43%.

How do nanoparticles enter the food chain?

Through translocation from airborne particles accumulating on plants.

What happens to nanoparticles in the circulatory system?

They can travel to many parts of the body and affect organ function.

What role does endocytosis play in cellular uptake?

It allows small nanoparticles to be taken up by various cell types.

What is a key feature of industrial exhaust that contributes to nanoparticle exposure?

It releases ultrafine particles into the air.

What size particles are classified as ultrafine dust?

Particles smaller than 100 nm.

Why are nanoparticles a concern for health?

They can cross biological barriers and accumulate in tissues.

What are the health implications of airborne microplastics?

They may accumulate in plants and impact herbivores and humans.

What is the importance of biomechanics in the uptake of nanoparticles?

Size and surface properties influence the ability to cross barriers.

How are respiratory conditions related to nanoparticle exposure?

Inhaled nanoparticles can lead to inflammatory responses in the lungs.

What are the main pathways for nanoparticles after being inhaled?

They can be cleared through mucociliary action or translocated to the lymphatic system.

What can be affected by ingested nanoparticles in the gastrointestinal tract?

The intestinal wall can uptake nanoparticles into the bloodstream.

What two mechanisms assist in the clearance of nanoparticles from the lungs?

Mucociliary clearance and macrophage phagocytosis.

What happens to very small nanoparticles (<6 nm) in the body?

They are relatively quickly cleared by the kidneys and excreted in urine.

What is a major concern regarding airborne particles in urban areas?

High exposure levels due to pollution from traffic and industry.

What are common effects of nanoparticle ingestion?

Possible translocation through the intestinal wall into circulation.

What method is used to visualize nanoparticles in biological research?

Fluorescent tagging and microscopy.

Why is the study of nanoparticles important in environmental health?

They have potential ecological and health implications.

How can nanoparticle technology be applied in the food industry?

For enhancement of food safety and delivery of nutrients.

What particle properties influence their biodistribution in tissues?

Size and surface charge are critical in determining biodistribution.

How do nanoparticles interact with biological membranes?

Their size and properties enable them to permeate membranes.

What is tissue biodistribution?

The distribution of nanoparticles throughout different tissues in the body.

What type of nanoparticles can cross the blood brain barrier?

Nanoparticles smaller than approximately 34 nm.

Which nanoparticles have been shown to impact enzymatic activity in organs?

Particles absorbed from tobacco smoke affecting MAO levels.

What is one way to assess air quality related to nanoparticles?

Monitoring particulate matter levels in the atmosphere.

What does PM refer to in environmental science?

Particulate Matter.

What type of nanoparticles are prevalent in tobacco smoke?

Fine and ultrafine particles, ranging from 10 nm to 700 nm.

What common daily activities expose individuals to nanoparticles?

Brushing teeth, using deodorant, and drinking coffee.

What are examples of engineered nanoparticles?

Silver nanoparticles used in medical applications.

What size factors influence the likelihood of nanoparticles entering the bloodstream?

Smaller nanoparticles are more likely to enter the bloodstream.

What is the purpose of the mucociliary escalator?

To clear debris and pathogens from the respiratory tract.

Why is understanding nanoparticle fate important?

To assess potential health risks and benefits associated with their use.