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## Which cube represents the cell with the least effective diffusion?

2. Which cube represents the cell with the least effective diffusion? Why? The largest cube (3 cm/side) because it has the largest surface area to volume ratio therefore it will take longer for the molecule to move into the center due to the large size.

## How do you calculate the extent of diffusion?

Calculate % diffusion = Volume diffused /total volume x 100.

## What happens to the ratio of surface area to volume when the cubes get larger?

As the cube size increases or the cell gets bigger , then the surface area to volume ratio – SA:V ratio decreases. When an object/cell is very small, it has a large surface area to volume ratio, while a large object/ cell has a small surface area to volume ratio.

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## What is the changing relationship between volume and surface area as an object gets bigger?

As a cell grows bigger, its internal volume enlarges and the cell membrane expands. Unfortunately, the volume increases more rapidly than does the surface area, and so the relative amount of surface area available to pass materials to a unit volume of the cell steadily decreases.

## What are the two types of life forms?

There are two kinds of cells, prokaryotic and eukaryotic, both of which consist of cytoplasm enclosed within a membrane and contain many biomolecules such as proteins and nucleic acids. Cells reproduce through a process of cell division, in which the parent cell divides into two or more daughter cells.

## What is an abnormal cell growth called?

Cancer is the uncontrolled growth of abnormal cells in the body. Cancer develops when the body’s normal control mechanism stops working. Old cells do not die and instead grow out of control, forming new, abnormal cells. These extra cells may form a mass of tissue, called a tumor.

## What causes cell growth?

For a typical dividing mammalian cell, growth occurs in the G1 phase of the cell cycle and is tightly coordinated with S phase (DNA synthesis) and M phase (mitosis). The combined influence of growth factors, hormones, and nutrient availability provides the external cues for cells to grow.

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## What type of cancer is the fastest growing?

In the United States, primary liver cancer has become the fastest growing cancer in terms of incidence, in both men and women.

## Can cancer grow overnight?

Scientists studying relationships between different types of cells have encountered some new and potentially important information about how—and when—cancerous tumors grow most aggressively. According to a new study, cancerous tumors may grow faster at night, during the hours typically taken up by sleep.

## Can you feel good and still have cancer?

Cancer is always a painful disease, so if you feel fine, you don’t have cancer. Many types of cancer cause little to no pain, especially in the early stages.

## What does your body feel like when you have cancer?

A cancer may also cause symptoms like fever, extreme tiredness (fatigue), or weight loss. This may be because cancer cells use up much of the body’s energy supply. Or the cancer could release substances that change the way the body makes energy.

## Can you have lung cancer for years and not know it?

Patients can (and usually do) live with lung cancer for many years before it becomes apparent. Early lung cancer is largely asymptomatic and internalisation of tumours means patients are not alerted by obvious physical changes.

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## Is being tired a sign of cancer?

The extreme fatigue that doesn’t get better with rest can be an early sign of cancer. Cancer uses your body’s nutrients to grow and advance, so those nutrients are no longer replenishing your body. This “nutrient theft” can make you feel extremely tired.

## What does cancer tiredness feel like?

The fatigue felt by people with cancer is different from the fatigue of daily life and different from the tired feeling people might remember having before they had cancer. People with cancer might describe it as feeling very weak, listless, drained, or “washed out” that may decrease for a while but then comes back.

## What type of cancer makes you very tired?

In bone marrow cancer, cancer cells may interfere with the normal production of blood cells leading to anemia and tiredness. Likewise in cancers related to the stomach, intestine cancers usually cause tiredness because of blood loss.

## Why am I so sleepy and tired all the time?

There are many possible causes for feeling chronically tired. It’s important to rule out medical conditions first, as fatigue often accompanies illness. However, feeling overly tired may be related to what you eat and drink, how much activity you get or the way you manage stress.

2021-05-14