What is the difference between natural killer cells and...

What is the difference between natural killer cells and macrophages? a. Natural killer cells are not always present in the body and must be induced, whereas macrophages are constantly present. b. Natural killer cells actually kill foreign cells, whereas macrophages serve only a signaling function. c. Only macrophages can invade host tissues to fight foreign cells that make their way into those tissues. d. Natural killer cells kill foreign cells through the processes of lysis and proteolysis, whereas macrophages kill foreign cells by phagocytosis.

What is the difference between natural killer cells and macrophages?
a. Natural killer cells are not always present in the body and must be induced, whereas macrophages are constantly present.
b. Natural killer cells actually kill foreign cells, whereas macrophages serve only a signaling function.
c. Only macrophages can invade host tissues to fight foreign cells that make their way into those tissues.
d. Natural killer cells kill foreign cells through the processes of lysis and proteolysis, whereas macrophages kill foreign cells by phagocytosis.

Key Concepts

Natural Killer Cells

These are lymphocytes within the innate immune system that can recognize and directly kill cells infected by viruses or transformed into cancer cells. They do so primarily through releasing enzymes like perforin and granzymes that disrupt target cell membranes, triggering cell lysis without prior sensitization.

Macrophages

Macrophages are large phagocytic cells derived from monocytes and are central to the innate immune response. They engulf and digest pathogens, dead cells, and debris through phagocytosis, and they also play a role in activating the adaptive immune system by presenting antigens to T cells.

Cell Lysis versus Phagocytosis

This concept distinguishes the two primary mechanisms by which these immune cells eliminate pathogens. Natural killer cells induce cell death primarily via cytotoxic granule release leading to lysis, while macrophages remove pathogens by engulfing them and utilizing intracellular degradation mechanisms within phagosomes.

Transcript

00:01 A question that asks about the difference between natural killer cells and macropages.

00:04 So natural killer cells and macrophages are two types of blood cells that are part of the innate immune response.

00:09 So macropagosophagus kill foreign infected cells through phagocythosis, which is when they take in a foreign cell or an infected cell into the into the cell, into the macrophage via endocytosis, where it is combined with lysosomes that eventually degraded.

00:27 As opposed to that, natural killer cells are able to kill their target via the release of granzymes and perforin.

00:41 So perforin opens up these pores while enzymes are able to basically degrade the foreign infected cell and that promotes lysis.

00:53 So those are just two different ways in which these white blood cells protect our bodies through the innate immune response.

01:03 So we'll see which statements are true.

01:04 Which statement is true.

01:06 So a c is that natural killer cells are not always present in the body and must be induced, whereas macrophages are constantly present.

01:12 So yes, macrophages and natural cell cells, they are both constantly present.

01:16 They're part of the innate immune response and they do not need to be activated or induced.

01:21 So a is incorrect.

01:23 So b -stays, natural killer cells actually kill foreign cells, whereas macrophages serve only a signaling function...

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