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arterioles are door between heart &tissue this door must be closed most of times &it just open in need so our CNS & smooth muscle of arterioles work to keep this door closed by basal vascular tone & vasomotor tone
A circuit must be closed in order for a current to flow because it helps keep a current flow pass. When the switch is closed on a circuit there is a constant flow. When the switches open the flow is disturbed around the circuit.
If the circuit is closed the electric current will be closed as well.
1. Monocots have one cotyledon in the embryo and dicots have two 2. Vascular bundles in monocots are closed in dicots these are open 3. Leaves have parallel venation in monocots & reticulate in dicots 4. Floral parts are in multiple of three in monocots, and five or their multiple in dicots.
Closed (I think. All vertebrates I know of have a closed system)
Vascular bundles may be radial or conjoint depending on the position of xylem and phloem. They may be open or closed depending on the presence or absence of cambium between their xylem and phloem. They may be scattered or arranged in a ring.
Closed. It also has a water-vascular system. :)
Indifference curve is a set of all the consumption bundles which are indifferent in the level of utility each bundle provide. Any bundle which provide higher utility will form another IC. Thus Indifference curve is a closed set.
Magnetic fields do, because there's no such thing as an isolated magnetic "pole", and a magnetic line always starts and ends at opposite poles of the same magnetized object. But electric fields don't. You can easily have a bundle of isolated positive charge over here and a bundle of isolated negative charge over there, whereupon the lines of the electric field start on one bundle and end on the other bundle. But electric field lines can also exist in closed loops, and they do that in radio waves, where the electromagnetic field propagates with an electric field component and a magnetic field component, and they both form closed loops.
It depends on the type of case, how it was closed, when it was closed, and if you have a good reason to reopen.
All respiratory systems are open as the function of a respiratory system is to exchange gases with inside of the body and the external world. The term 'open' or 'closed' refers to the vascular system.
The only reason why any ride at Disneyland would be closed is technical difficulties
One reason was that congress outlawed the closed shop
Unicellulars don't have any vascular system they take food by diffusion. Small animals such as some invertebrates have open circulatory system, larger animals like vertebrate have a closed circulatory system.
The only reason a ride at Disneyland would be closed is due to technical difficulties or remodeling.
The collateral open vascular bundles of dicots display xylem and phloem that are separated from each other by the fascicular cambium. These vascular bundles are also often surrounded by abundle sheath and the whole structure is imbedded in a parenchyma tissue called pith. Another type of vascular bundles are the bicollateral bundles.
It is tempting to say because they have "a closed mind about closed minds", but mainly the reason for disliking closed minds has to do with feelings of value and worth which are denied those whose ideas and opinions are being shut out.