Web18 nov. 2015 · Muscle cells are specialized to contract and relax. They have several unique protein molecules (actin, myosin, etc.) that interlock and are responsive to the local concentration of calcium. When ... Web5 apr. 2024 · All vascular plants have tracheids, which are less specialized but have a special cell wall known as a pit membrane. This structure prevents the passage of damaging air bubbles from one xylem vessel to another. These are typically the only cells found in the xylem of gymnosperms, such as pine trees, and seedless vascular plants, …

How are xylem and phloem cells adapted to their function?

Websieve element, in vascular plants, elongated living cells of the phloem, the nuclei of which have fragmented and disappeared and the transverse end walls of which are pierced by sievelike groups of pores (sieve plates). They are the conduits of food (mostly sugar) transport from the leaves to the rest of the plant. In angiosperms, these cells are known … WebIn Phloem 1.Glucose is made in photosynthesis and converted to sucrose for transport in the source cells. 2.Sucrose is actively transported into companion cells using a sucrose-H+ contransport protein. 3.Sucrose moves from the companion cells to the sieve tube cells through plasmodesmata. Called "phloem loading" how a scary movie watcher might recoil

Xylem and Phloem (A Level) — the science hive

Web18 apr. 2024 · Adaptations of phloem to its functions. The sieve tubes are elongated, cylindrical cells connected, end to end. Their end walls have perforated sieve plates to … WebIn plants, for the transportation of food and water vascular tissues are present known as Xylem and Phloem. These tissues are present together in the form of vascular bundles. … Web3 mei 2024 · Macroscopic Features. Monocot leaves tend to have parallel venation, as opposed to the branching patterns seen in eudicots. Figure 13.2. 1: These two monocot leaves both have parallel venation. It is more obvious in the leaf on the right. However, if you look closely at the leaf on the left, you'll see that those veins do not cross each other. how a satnav works