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Crocosmia corm with the tunic partly stripped to show its origin at the nodes on the corm cortex. Crocosmia corm anatomy, showing tunic, cortex of storage tissue, central medulla, and emergence of a new corm from a bud near the top. Crocosmia corm with stolons emerging through the tunic. The stolons originate at the axillary buds of the corm ...
Both sexual and asexual means are used to increase the number of plants; seeds and multiplication of corms are the most common means of production, but tissue culture can be used, [114] most commonly for saffron crocus. New corms are formed on top of the older corm which withers away, and cormels are produced from axillary buds. [112]
Corm - Short, upright, hard, or fleshy stems covered with thin, dry papery leaves. Rhizome - With reduced scale-like leaves. The top can generate leafy stems while the bottom can produce roots. Iris and many grasses. Stolon - Horizontal stems that run at or just below the soil surface with nodes that root and long internodes, the ends produce ...
Perimysium is a sheath of dense irregular connective tissue that groups muscle fibers into bundles (anywhere between 10 and 100 or more) or fascicles. Studies of muscle physiology suggest that the perimysium plays a role in transmitting lateral contractile movements .
Tissue of origin [citation needed] Function Group [footnote 1] Subgroup Germ layer of origin Biomarkers Brunner's gland cell crypt basal stem cells in duodenum, duodenal submucosa [citation needed] enzyme and alkaline mucus secretion Exocrine secretory epithelial cells Endoderm: Insulated goblet cell: respiratory and digestive tracts mucus ...
A sarcomere (Greek σάρξ sarx "flesh", μέρος meros "part") is the smallest functional unit of striated muscle tissue. [1] It is the repeating unit between two Z-lines. Skeletal muscles are composed of tubular muscle cells (called muscle fibers or myofibers) which are formed during embryonic myogenesis.
The protein complex composed of actin and myosin, contractile proteins, is sometimes referred to as actomyosin.In striated skeletal and cardiac muscle, the actin and myosin filaments each have a specific and constant length in the order of a few micrometers, far less than the length of the elongated muscle cell (up to several centimeters in some skeletal muscle cells). [5]
The contractile function of vascular smooth muscle regulates the lumenal diameter of the small arteries-arterioles called resistance arteries, thereby contributing significantly to setting the level of blood pressure and blood flow to vascular beds. Smooth muscle contracts slowly and may maintain the contraction (tonically) for prolonged ...