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Answer:
microvilli
Explanation:
having microscopic projections called microvilli. The epithelial cells of the proximal convoluted tubule are adapted.
Across 5: predation
across 6 hominid
down 3 : Distribution
down 9 : glaciations
Answer:
As a cell grows bigger, its internal volume enlarges and the cell membrane expands. Unfortunately, the volume increases more rapidly than does the surface area, and so the relative amount of surface area available to pass materials to a unit volume of the cell steadily decreases.
Myofibrils are the building blocks or contractile unit of each muscle fiber. The tiniest functional unit of skeletal muscle, the sarcomere, is found in the myofibrils and is made up of protein filaments: actin (thin) and myosin (thick).
