Examples of bundle of His in the following topics:
-
- The cardiac cycle is the coordination of the filling and emptying of blood by electrical signals that cause the heart muscles to contract and relax.
- The pumping of the heart is a function of the cardiac muscle cells, or cardiomyocytes, that comprise the heart muscle.
- From the AV node, the electrical impulse enters the bundle of His, then to the left and right bundle branches extending through the interventricular septum.
- This information can be observed as an electrocardiogram (ECG): a recording of the electrical impulses of the cardiac muscle.
- The beating of the heart is regulated by an electrical impulse that causes the characteristic reading of an ECG.
-
- When the stem is viewed in cross section, the vascular bundles of dicot stems are arranged in a ring.
- In (a) dicot stems, vascular bundles are arranged around the periphery of the ground tissue.
- The xylem tissue is located toward the interior of the vascular bundle; phloem is located toward the exterior.
- Sclerenchyma fibers cap the vascular bundles.
- In (b) monocot stems, vascular bundles composed of xylem and phloem tissues are scattered throughout the ground tissue.
-
- The brain is the part of the central nervous system that is contained in the cranial cavity of the skull.
- A thick fiber bundle, the corpus callosum, connects the two hemispheres, allowing information to be passed from one side to the other.
- For example, the neurons that control movement of the fingers are next to the neurons that control movement of the hand.
- The role of the hippocampus in memory was partially determined by studying one famous epileptic patient, HM, who had both sides of his hippocampus removed in an attempt to cure his epilepsy.
- His seizures went away, but he could no longer form new memories (although he could remember some facts from before his surgery and could learn new motor tasks).
-
- The spinal cord is a bundle of nerves that is connected to the brain and relays information from the brain to the body and vice versa.
- Connecting to the brainstem and extending down the body through the spinal column is the spinal cord: a thick bundle of nerve tissue that carries information about the body to the brain and from the brain to the body.
- The spinal cord is contained within the bones of the vertebral column, but is able to communicate signals to and from the body through its connections with spinal nerves (part of the peripheral nervous system).
- Grey matter is also composed of interneurons, which connect two neurons, each located in different parts of the body.
- The extent of the paralysis depends on the location of the injury along the spinal cord and whether the spinal cord was completely severed.
-
- Cells of the meristematic tissue are found in meristems, which are plant regions of continuous cell division and growth.
- In stems, the xylem and the phloem form a structure called a vascular bundle ; in roots, this is termed the vascular stele or vascular cylinder.
- Each teardrop-shaped vascular bundle consists of large xylem vessels toward the inside and smaller phloem cells toward the outside.
- The vascular bundles are encased in ground tissue and surrounded by dermal tissue.
- The shoot system of a plant consists of leaves, stems, flowers, and fruits.
-
- Skeletal muscles are composed of striated subunits called sarcomeres, which are composed of the myofilaments actin and myosin.
- They are bound together by perimysium, a sheath of
connective tissue, into bundles termed fascicles; which are in turn bundled
together to form muscle tissue.
- Myocytes can be incredibly large, with diameters of up to
100 µm and lengths of up to 30 cm.
- Myofibrils are composed of long myofilaments of actin and
myosin and other associated proteins.
- The sarcomere is the functional contractile region of the myocyte, and defines the region of interaction between a set of thick and thin filaments.
-
- C4 plants, in contrast, concentrate CO2 spatially, with a RuBisCO reaction centre in a "bundle sheath cell" that is inundated with CO2.
- Cross section of a C4 plant, specifically of a maize leaf.
- The harsh conditions of the desert have led plants like these cacti to evolve variations of the light-independent reactions of photosynthesis.
- Cross section of a CAM (crassulacean acid metabolism) plant, specifically of an agave leaf.
- Vascular bundles shown.
-
- It consists of the upper and lower epidermis, which are present on either side of the leaf.
- Below the epidermis of dicot leaves are layers of cells known as the mesophyll, or "middle leaf."
- Similar to the stem, the leaf contains vascular bundles composed of xylem and phloem .
- A single vascular bundle, no matter how large or small, always contains both xylem and phloem tissues.
- This scanning electron micrograph shows xylem and phloem in the leaf vascular bundle.
-
- In most types of vertebrate animals, it consists of two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS).
- The PNS consists mainly of nerves, which are long fibers that connect the CNS to every other part of the body.
- Echinoderms, such as sea stars, have nerve cells that are bundled into fibers called nerves.
- Although glial cells support neurons, recent evidence suggests they also assume some of the signaling functions of neurons.
- (b) In echinoderms, nerve cells are bundled into fibers called nerves.
-
- The senses of smell and taste combine at the back of the throat.
- This chemoreception in regards to taste, occurs via the presence of specialized taste receptors within the mouth that are referred to as taste cells and are bundled together to form taste buds.
- Uniform distribution of taste receptors (the myth of the tongue map)
- Each of these receptors is specially adapted to determine one type of taste sensation.
- Each of these receptors is specially adapted to determine one type of taste sensation.