Cell Injury and Adaptation

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30 Questions

Cell injury occurs when cells are stressed and cannot adapt to ______.

injury

Atrophy is a ______ process except when it is caused by loss of nerve supply.

reversible

Hypertrophy occurs when a cell or tissue is exposed to ______ workload.

increased

Metaplasia is a process in which one cell type is converted to ______ cell type.

another

Prolonged smoking causes columnar epithelium to change to ______ epithelium in respiratory passages.

stratified squamous

Chronic ______ or inflammation can cause metaplasia.

irritation

Severe anemia reduces the ______ capacity of blood.

oxygen-carrying

Chemical agents can alter ______ pressure around the cell, resulting in cell injury.

osmotic

Infectious agents include ______, viruses, fungi, protozoa, and rickettsiae.

bacteria

Cellular swelling is caused by the accumulation of ______ due to failure of active transporters and cell membrane integrity.

water

Cellular accumulation can lead to the buildup of ______, protein, calcium, and uric acid.

fats

Necrosis occurs due to ______, toxins, infections, and trauma.

ischemia

Pyknosis is characterized by the nucleus ______

shrinks

In Karyorrhexis, the pyknotic nucleus is ______

fragmented

In Karyolysis, DNA is degraded by ______

endonuclease

Coagulative Necrosis is characterized by dead cells, but tissue structure remains intact for ______ to ______

days to weeks

In Liquefactive Necrosis, enzymes of leukocytes ______ the tissue

digest

Liquefied necrotic tissue is creamy yellow due to the presence of ______

dead leukocytes

The intrinsic pathway of apoptosis is activated in response to ______ damage or lack of oxygen or nutrients.

DNA

Caspases have two actions: catalyze mass ______ in the cytoplasm and activate nucleases.

proteolysis

The intrinsic pathway of apoptosis depends on ______ Activated from inside the cell.

mitochondria

Bcl2 proteins are ______ regulators of apoptosis that control release of mitochondrial proteins to the cytoplasm.

intracellular

Apoptosis depends on ______ proteins: proteolytic enzymes.

Caspase

Released mitochondrial proteins activated ______ that catalyze mass proteolysis and activate nucleases.

caspases

Bcl2 proteins cause dimerization of ______ proteins

Bax and Bak

Cytochrome c in cytosol activates ______ which have two actions

caspases

Cells fragment into membrane-bound pieces (apoptotic bodies), which are phagocytosed by ______

macrophages

The induction of apoptosis by the mitochondrial pathway involves the action of sensors and effectors of the ______ family

Bcl-2

Engagement of ______ receptors leads directly to caspase activation

death

Mitochondrial proteins, especially ______, leak into cytosol

cytochrome c

This quiz covers the concept of cell injury, its causes, and cellular adaptation mechanisms such as atrophy. It also explores the consequences of reduced cell or tissue use, including prolonged bed rest, disuse of limbs, and poor nutrition.

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