Examples of node in the following topics:
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- Nodes are points of attachment for leaves, aerial roots, and flowers.
- The stem region between two nodes is called an internode.
- Leaves are attached to the plant stem at areas called nodes.
- An internode is the stem region between two nodes.
- The leaves just above the nodes arise from axillary buds.
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- Lymph nodes scattered throughout the body house large populations of T and B cells, dendritic cells, and macrophages .
- These antigens are filtered through lymph nodes before the lymph is returned to circulation.
- Functionally, the spleen is to the blood as lymph nodes are to the lymph.
- The liquid passes through (b) lymph nodes that filter the lymph that enters the node through afferent vessels, leaving through efferent vessels.
- Lymph nodes are filled with lymphocytes that purge infecting cells.
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- A node of Ranvier is a natural gap in the myelin sheath along the axon .
- Action potential "jumps" from one node to the next in saltatory conduction.
- Nodes of Ranvier also save energy for the neuron since the channels only need to be present at the nodes and not along the entire axon.
- Nodes of Ranvier are gaps in myelin coverage along axons.
- Nodes contain voltage-gated K+ and Na+ channels.
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- The internal pacemaker starts at the sinoatrial (SA) node, which is located near the wall of the right atrium.
- Electrical charges spontaneously pulse from the SA node, causing the two atria to contract in unison.
- The pulse reaches a second node, the atrioventricular (AV) node, between the right atrium and right ventricle, where it pauses for approximately 0.1 seconds before spreading to the walls of the ventricles.
- The signal is (b) delayed at the atrioventricular node before it is passed on to the (c) heart apex.
- Summarize the caridac cycle and explain the role of the SA node and the AV node in regulating the its rhythm
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- A rhizome is a modified stem that grows horizontally underground; it has nodes and internodes.
- Stolons are stems that run almost parallel to the ground, or just below the surface, and can give rise to new plants at the nodes.
- Runners are a type of stolon that runs above the ground and produces new clone plants at nodes at varying intervals: strawberries are an example.
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- Branches arising from the nodes are made of smaller cells.
- Male and female reproductive structures are found on the nodes; the sperm have flagella.
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- Plants that have only one leaf per node have leaves that are said to be either alternate or spiral.
- If there are three or more leaves connected at a node, the leaf arrangement is classified as whorled.
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- The formation of hard nobs at the middle finger joints (known as Bouchard's nodes) and at the farther away finger joint (known as Heberden's node) are a common feature of Osteoarthritis in the hands.
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- A phylogenetic tree is composed of nodes and branches.
- The internal nodes represent ancestors and are points in evolution when, based on scientific evidence, an ancestor is thought to have diverged to form two new species.
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- Processed antigens displayed on APCs are detected by T cells in the MALT and at various mucosal induction sites, such as the tonsils, adenoids, appendix, or the mesenteric lymph nodes of the intestine.
- Immune tolerance is brought about by specialized APCs in the liver, lymph nodes, small intestine, and lung that present harmless antigens to a diverse population of regulatory T (Treg) cells: specialized lymphocytes that suppress local inflammation and inhibit the secretion of stimulatory immune factors.
- Other antigen-loaded dendritic cells migrate through the lymphatic system where they activate B cells, T cells, and plasma cells in the lymph nodes.