Logan Steele
Spongy tissue is a type of tissue found in both plants and animals. In the latter, it contains smooth muscles, fibrous tissues, spaces, veins, and arteries. Spongy muscles, also known as smooth muscles, are involuntary muscles that line the inside of some organs. They perform essential functions, such as moving waste through intestines and aiding lung expansion during breathing. These muscles are present in various body systems, including the digestive, respiratory, urinary, and reproductive systems. During an erection, spongy muscles in the trabecular septa relax and fill with blood, contributing to penile enlargement.
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What You'll Learn
Spongy tissue in plants and animals
Spongy tissue is a type of tissue found in both plants and animals. In plants, it is known as spongy mesophyll and is a part of the mesophyll, forming a layer next to the palisade cells in the leaf. The spongy mesophyll is characterised by loosely packed, irregularly shaped cells with intercellular airspace, and it plays a crucial role in the interchange of gases (CO2) necessary for photosynthesis. The porous structure of the spongy mesophyll allows for efficient gas exchange, with gases dissolving in the thin layer of water covering the cells as they move in and out. This enables carbon dioxide to diffuse into the cells and oxygen to diffuse out during photosynthesis.
In animals, spongy tissue is a type of connective tissue that contains smooth muscles, fibrous tissues, spaces, veins, and arteries. It is found in various parts of the body, such as the corpus spongiosum penis in males and the oral mucosa, which has been studied for urethra reconstruction. Spongy tissue in animals is also associated with certain disorders, such as epithelial tumours and nonepithelial cancers derived from connective tissues.
The structure and function of spongy tissue differ between plants and animals. In plants, the spongy mesophyll contributes to carbon capture and provides mechanical stability to the leaf. It is essential for the plant's ability to perform photosynthesis and exchange gases efficiently. In animals, spongy tissue serves a variety of purposes depending on its location and the specific composition of muscles, fibrous tissues, and blood vessels it contains.
Additionally, the development of spongy tissue in plants and animals also varies. In plants, the spongy mesophyll develops from an initially confluent tissue into a complex network of cells with a large proportion of intercellular airspace. This development is influenced by factors such as cell growth, adhesion, stiffness, and tissue pressure. In animals, the formation of spongy tissue is not as well understood, but it is known that animal stem cells contribute to replacing ageing or injured tissues, similar to the role of meristematic tissue in plants.
Overall, spongy tissue plays important and diverse roles in both plants and animals, contributing to essential functions such as gas exchange in plants and providing structural support and connectivity in animals.
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Spongy mesophyll in plants
Spongy mesophyll is a complex, porous tissue found in plant leaves that enables carbon capture and provides mechanical stability. It is a type of tissue found in both plants and animals. In plants, it is part of the mesophyll, forming a layer next to the palisade cells in the leaves. The mesophyll, or central leaf, consists of soft-walled, unspecialized cells known as parenchyma. Parenchyma forms the internal layers of leaves, the cortex (outer layers) and pith (innermost layers) of stems and roots, and the soft tissues of fruits.
The spongy mesophyll's function is to allow for the interchange of gases (CO2) that are needed for photosynthesis and respiration. The cells are covered by a thin layer of water, and gases dissolve in this water as they move into and out of the cells. When the plant is photosynthesising during the day, carbon dioxide diffuses into the spongy mesophyll cells, and oxygen diffuses out. The carbon-fixation pathway begins in the mesophyll cells, where carbon dioxide is converted into bicarbonate, which is then added to the three-carbon acid phosphoenolpyruvate (PEP) by the enzyme phosphoenolpyruvate carboxylase.
The spongy mesophyll is less likely to undergo photosynthesis than the palisade mesophyll. It is also the name of a disorder of fruit ripening that can reduce the value of a yield, especially in mangoes. In the Alphonso mango variety, this problem is particularly common, giving soft, white, 'corky' tissue.
The development of the spongy mesophyll has been studied through computer simulations of deformable polygons, which have been compared with empirical images of spongy mesophyll development in the model plant species Arabidopsis thaliana. These simulations have helped to understand the necessary conditions for the development of the spongy mesophyll microstructure.
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Spongy tissue in the penis
The penis is composed of spongy tissue, which is also referred to as erectile tissue. This tissue is made up of elastic fibres, collagen fibres, smooth muscles, arteries, and veins. The penile shaft contains two corpora cavernosa and one corpus spongiosum, which are all composed of spongy tissue.
The corpora cavernosa are two expandable erectile tissues that run along the length of the penis, from the pubic bones to the head of the penis. They are made of a sponge-like tissue that contains trabeculae, irregular blood-filled spaces lined by endothelium and separated by septum of the penis. During an erection, the corpora cavernosa fill with blood, causing the penis to become rigid.
The corpus spongiosum is a smaller region of erectile tissue located along the bottom of the penis. It surrounds the male urethra and forms the glans penis. The corpus spongiosum has a thinner and more elastic tunica albuginea, allowing it to remain pliable during an erection. This prevents the urethra from being compressed, ensuring that it remains a viable channel for ejaculation.
The tunica albuginea is a dense fibrous sheath of connective tissue that surrounds the corpora cavernosa and the corpus spongiosum. It consists of two layers: the outer longitudinal layer and the inner circular layer. The tunica albuginea becomes thicker where it forms a groove to accommodate the corpus spongiosum.
The corpus spongiosum and corpora cavernosa develop as early as the 13th week post-conception in the fetal period. During this period, the corpus spongiosum has a higher proportion of collagen compared to the corpora cavernosa.
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Spongy tissue in bones
Bones are made up of two types of bone tissue: compact and spongy. The outer layer of bones is composed of compact bone tissue, while the inner layer is made up of spongy bone tissue, also known as cancellous or trabecular bone. Spongy bone is found in most areas of bone that are not subject to great mechanical stress. It makes up much of the enlarged ends (epiphyses) of long bones and is the major component of the ribs, shoulder blades, flat bones of the skull, and several short, flat bones in the skeleton.
Spongy bone is composed of thin intersecting laminae that form a lattice-like arrangement of osteocytes, known as trabeculae. Trabeculae are lamellae arranged as rods or plates, forming a mesh-like network of bony spicules of varying sizes. This network projects into the medullary cavity from the internal circumferential lamellae of the cortical bone. The trabecular network of spongy bone aids in reducing bone weight and density and helps transfer force from the articular surface of cortical bone. The porous tissue makes the bones lighter, allowing muscles to move them more easily.
The spaces between the trabeculae of spongy bone contain red bone marrow, where blood cells and haematopoiesis (the formation of blood cellular components) occur. The red bone marrow of the femur and the interior of other large bones, such as the ilium, form blood cells. Blood vessels within the red bone marrow supply osteocytes with nutrients and aid in removing waste products. Osteocytes, the living cells of bone tissue, form the mineral matrix of bones and regulate bone formation and growth. They are found in tiny cavities between the concentric rings of the bone matrix.
The trabecular network of spongy bone develops as an individual learns to walk and can dynamically alter when stress lines change, such as after a leg injury or fracture. The mesh-like structure can resist compression forces from different directions and provide strength to the bone. This helps transmit forces across joints without damaging the bone.
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Spongy tissue in tapeworms
Spongy tissue, also known as cancellous tissue, is found in both plants and animals. In plants, it is part of the mesophyll, where it forms a layer next to the palisade cells in the leaf. In animals, spongy tissue contains smooth muscles, fibrous tissues, spaces, veins, and arteries.
In tapeworms, the space enclosed by the tegument is filled with a spongy tissue called the parenchyma. The parenchyma is composed of parenchymal cells, which are the primary sites for the synthesis and storage of glycogen. Tapeworms are parasitic flatworms that infect the intestines of animals and humans. They can infest humans when infected meat is consumed, with tapeworm larvae embedded in the muscle tissue. Once in the human intestine, the larvae mature into intestinal worms.
Tapeworms can also infect humans through the consumption of raw or undercooked meat containing tapeworm larvae. The larvae then bore through the intestinal wall and into a blood vessel, where they are carried to the muscle tissue. Here, they form a protective capsule called a cysticercus or bladder worm. If the cysticercus is consumed in raw meat, it attaches to the host's intestine and develops into a mature adult tapeworm.
Tapeworms can cause mild gastrointestinal symptoms such as loss of appetite, stomach cramps, nausea, weakness, diarrhea, and fatigue. Treatment for tapeworm infections typically involves anthelmintic drugs, which kill the parasitic worms. Healthcare providers may also prescribe anti-inflammatory medications to reduce inflammation and manage secondary symptoms.
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Frequently asked questions
Spongy muscles refer to smooth muscles that are part of spongy tissue, which also contains fibrous tissues, spaces, veins, and arteries.
Spongy muscles are found in the walls of hollow visceral organs, such as the liver, pancreas, and intestines. They are also present in the corpus spongiosum penis.
Spongy muscles have various functions depending on their location in the body. For example, during an erection, spongy muscles in the trabecular septa relax and fill with blood, contributing to penile enlargement. In the respiratory system, they help the lungs expand during breathing.
