We clamped really close tightly together, and then, students in front of me, there was this cabinet … they pushed it in front of them so that it would deter some of the bullets.
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Hold them close, tightly to your bosom, and thank the good folks at the Cleveland Branch of the National Weather Service for reminding you just how delicate your tiny, furry little friend's life really is.
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It results when the lower esophageal sphincter, a ring of muscle between the esophagus and the stomach, fails to close tightly enough to prevent the contents of the stomach from moving up instead of down.
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The fourth dentary tooth is raised in the lower jaw to form an effective canine. The foremost teeth of the lower jaw are much smaller and lower than the fourth tooth. At the tip of the jaw the first dentary tooth is procumbent, or directed forward. The teeth of the upper and lower jaws form an alternate pattern to allow the jaw to close tightly.
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Velopharyngeal insufficiency (VPI) can occur as a result of an unrepaired or repaired cleft lip and palate. VPI is the inability of the soft palate to close tightly against the back of the throat during speech, resulting in incomplete velopharyngeal closure. In turn, this results in speech abnormalities. Velopharyngeal closure is necessary during speech because it forms a seal between the nose and mouth, allowing the production of normal speech sounds.
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Once the lymph flows into the next lymphangion, it cannot return to the previous lymphangion, as the semilunar valves close tightly. In conditions when the pressure in a lymphatic is sufficiently great, the valves may fail, and there can indeed be backward flow of lymph resulting in edema of the drained region. This may happen with blockage of lymph flow because of pathology in the draining lymph node or at some point in the vessel.
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Another important adaptation that aids breathing while out of water is their enlarged gill chambers, where they retain a bubble of air. These chambers close tightly when the fish is above water, due to a ventromedial valve of the gill slit, keeping the gills moist, and allowing them to function while exposed to air. Gill filaments are stiff and do not coalesce when out of water. The different species have adapted to various diets on the mudflats.
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The Mexican hylid casque-headed frog, Pternohyla fodiens, utilizes the head casque to close the entrance of its refuge in a tree cavity by deflecting the head. Due to their frequent foraging on the ground, this species often makes use of vertical burrows already extant in the ground layer as well. Upon arrival of intruder, P. fodiens assumes an immobile position – the head tipped back, with the entire body assumed in a gentle arch. The eyes close tightly, fore-legs are brought forward and upward, and hind-legs are flexed upward.
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The boring clam is the smallest clam in the subfamily Tridacninae and grows to a maximum shell size of . It has two, thick valves joined together by a hinge which is typically between a third and less than a half of the width of the shell. Typically shells are slightly to moderately elongate, and the animal is strongly inflated, especially near the hinge. The upper valve has six to ten flattish folds which interlock at the margin with similar folds on the lower valve so that they can clamp together and the shell can close tightly.
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