look up bacillarophyta on wiki. these were some of the first organisms to live on earth.
Pennate diatoms have elongated, bilaterally symmetrical cells with a slit-like opening, while centric diatoms are circular or oval in shape with radial symmetry. Pennate diatoms are typically found in benthic habitats, while centric diatoms are more common in planktonic environments.
Yes, centric diatom are algae that are species that display radial symmetry. Diatoms are like clams, they have a two-part silica cell wall, called frustules. Diatoms are then divided into two groups based on the symmetry of their frustules, bilaterally symmetrical are called pennate diatom and centric diarom are radial symmetrical.
Most diatoms are non-motile, simply being carried by currents and turbulence - however, some types move via flagellation (the swimming motion of small hair-like features called 'flagella'). Flagella are projections from the cell body which are moved back and forth (flagellated) to provide motion. Identical in structure to flagella (but somewhat shorter in length), cilia are present in mammals primarily to facilitate the movement of fluids and mucus across tissues/membranes.
This type of muscle arrangement is called pennate. Pennate muscles maximize the number of muscle fibers in a given space, allowing for greater force production. Examples of pennate muscles include the deltoid and gastrocnemius.
Pennate diatoms have elongated, bilaterally symmetrical cells with a slit-like opening, while centric diatoms are circular or oval in shape with radial symmetry. Pennate diatoms are typically found in benthic habitats, while centric diatoms are more common in planktonic environments.
pennate diatoms
Yes, centric diatom are algae that are species that display radial symmetry. Diatoms are like clams, they have a two-part silica cell wall, called frustules. Diatoms are then divided into two groups based on the symmetry of their frustules, bilaterally symmetrical are called pennate diatom and centric diarom are radial symmetrical.
one lives in salt water and the other in fresh water.
Most diatoms are non-motile, simply being carried by currents and turbulence - however, some types move via flagellation (the swimming motion of small hair-like features called 'flagella'). Flagella are projections from the cell body which are moved back and forth (flagellated) to provide motion. Identical in structure to flagella (but somewhat shorter in length), cilia are present in mammals primarily to facilitate the movement of fluids and mucus across tissues/membranes.
This type of muscle arrangement is called pennate. Pennate muscles maximize the number of muscle fibers in a given space, allowing for greater force production. Examples of pennate muscles include the deltoid and gastrocnemius.
yes
parallel
Strap
Pennate MusclesIn a pennate muscle, the fascicles form a common angle with the tendon. Because the muscle cells pull at an angle, contracting pennate muscles do not move their tendons as far as parallel muscles do. But a pennate muscle contains more muscle fibers--and, as a result, produces more tension--than does a parallel muscle of the same size. (Tension production is proportional to the number of contracting sarcomeres; the more muscle fibers, the more myofibrils and sarcomeres.)
parallel
The muscle named for the arrangement of its fascicles is the "pennate" muscle. In pennate muscles, the fascicles are arranged obliquely to the tendon, resembling a feather's structure. This arrangement allows for greater force production due to the increased number of muscle fibers that can fit into a given area, making pennate muscles efficient for generating power. Examples include the deltoid and the rectus femoris.