What is formed by a t tubule and two adjacent terminal cisternae?

Why are cells spherical instead of cubical if a cube has a larger surface area to volume ratio than a sphere does?

The cells of the body have different sizes, shapes and surface area to volume ratios depending on their function, that is, their structure/function relationships. For example, lung alveolar cells are flat or squamous cells that optimize surface area to volume ratio for gas exchange between blood and the atmosphere; neurons have long tubular axons that increase surface area/volume ratio; cuboidal skin cells of the basal layer are cube shaped and optimally shaped for blood gas and nutrient exchange as well as for their function of adherence and skin replicative function; kidney proximal convoluted tubule cells are cuboid, but extend their membrane surface area for maximal reuptake of blood nutrients by the extension of microvilli on the luminal side of the proximal convoluted tuble. Red blood cells are biconcave discs that, thereby, increase surface area for gas exchange. White blood cells are pretty spherical indicating a requirement for maximizing volume, at the expense of surface area, for antibody production or bacterial destruction etc. . Skeletal muscle cells are long and spindle shaped and often fuse together with other muscle cells in development in order to span the distance across a joint, for example. But you are correct in stating that a cube would have greater surface area to volume ratio than a sphere as a function of length of side or radius (in the case of a sphere).

What is formed by a t tubule and two adjacent terminal cisternae?

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Why are cells spherical instead of cubical if a cube has a larger surface area to volume ratio than a sphere does?

What is the difference between a dyad and triad in skeletal cardiac muscle?

Two terminal cisternae and a T- tubule?

The triads of a muscle fiber consist of?

The enlarged perpendicular chambers of the sarcoplasmic reticulum that store calcium ions lies adjacent to the t tubule at the you band and the a band interface of the skeletal muscle sarcomere?

The skeletal muscle complex known as the triad consists of what?

What event most directly triggers the release of calcium from the terminal cisternae?

What stores calcium important in muscle contractions?

Enlarged portion of sarcoplasmic reticulum on either side of a transverse tubule?

What conducts muscle impulses deep in the sacroplasm of a muscle to the cisternae?

What is the organelle that stores calcium in resting muscle cells?

The---- is the terminal part of the nephron?

Which parts of the renal tubule is formed by cuboidal epithelial cells bordered by dense microvilli?

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