Describe the structure of a fish's heart and explain how blood flows to and from it.

The heart of a fish is known as a branchial heart

Function and structure;it's main structure is to pump Venous blood to ventral aorta into gills(i.e branchial) and then to somatic vasculature.Thus,branchial and systematic vascular beds are arranged in series with heart.

Apart from heart,heart like organs are present in Agnatha(Myxine and petromyzon).The heart of fishes consist of four Chambers a sinous venosus, an atrium,a ventricle and a conus or a bulbus Arteriosus.

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when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave