It was even mentioned in the script that the giants would move slowly. I think that's a given for anything at a large size. If you look at large excavation machinery, it doesn't operate fast, it slowly achieve it's objectives given it's size and movements.
More of a matter of density than anything.
Any human that grows huge would have to be like a sponge (low density, lots of porous holes interconnecting by a squishy foam) or a tree (lots of thin flexible fibers connected by a strong sap glue) to not collapse by its own weight.
The Goo would not magically add any notable mass to the cat, the ducks, the dog, the spider, or the humans. So even a Goo-enlarged duck the size a car would weigh the exact same weight as a regular sized duck. A Goo-enlarged human would be spongy and probably die from insufficient blood supply before their size reached a 2% size increase. Since they are spongy, a knife wound would be fatal rather quickly (not from blood loss or the seam-ripping injury), but from too much oxygen introduced into the blood stream. Another obvious problem with being a big sponge-body is that you will exhale more water vapor (larger lung surface area) faster than you can intake it unless you insert a running garden hose up your anus. There would also be the obvious problem of that while the body grows to giant sizes, the total amount of usable calcium for the bones would not be increased. Unless The Goo can make pseudo-bones grow rapidly like Kudzu wood-type branchings, the flesh will grow, the bones will remain the same. Can you say, "really unpleasant pulsing lumps of agonized writhing flesh?" Now visualize it in your mind. Ech!
The Bohr effect is a microbiological phenomenon first described in 1904 by the Danish physiologist Christian Bohr (father of physicist Niels Bohr), stating that hemoglobin's oxygen binding affinity is inversely related both to acidity and to the concentration of carbon dioxide. That is to say, a decrease in blood pH or an increase in blood CO2 concentration will result in hemoglobin proteins releasing their loads of oxygen and a decrease in carbon dioxide or increase in pH will result in hemoglobin picking up more oxygen. Since carbon dioxide reacts with water to form carbonic acid, an increase in CO2 results in a decrease in blood pH.
http://en.wikipedia.org/wiki/Bohr_effectHuman blood exchanges carbon dioxide only if oxygen is present in the red blood cells. If the blood serum has too much oxygen, carbon dioxide will not be exchanged.
Myth 1. Deep breathing gives me more oxygenhttp://buteykosleep.com/breathing-basics/myths-about-breathing/myth-1- deep-breathing-gives-me-more-oxygen.html
Bohr Effect: Healthy vs. Sick People
Bohr effect (medical or scientific explanation is below)http://www.normalbreathing.com/CO2-bohr-effect.phpA knife works because it concentrates a larger surface area force into a hard thin point. A hammer works because it focuses the strength of the arm plus the kinetic velocity of swinging the hammer into a tiny hard spot the size of a coin.
Now if the humans were enlarged by a "growth ray", the duration of exposure effect and the resultant enlargement size would be critical to the final state of the enlarged object. If you "growth ray" enlarge an apple to 200% size in a few seconds, the apple (at room temperature) would lose proportionally lose 50% of it's internal temperature and potentially freeze solid. The temperature of the object depends on the density of the object at that room temperature, a 50% near-instant density decrease results in a 50% loss of temperature until the room warms the object up (thusly the reason why compressed steam can freeze upon expansion). The other problem is that unless any "Growth Ray" was applied to 100% of the body all at once, some areas would enlarge faster and usually in a mere soft circular (denser at the center & thinner at the edges) or a hemispherical pattern. Which is horrifying if you think of what this would do if aimed at the chest (causing it to grow 200 times faster than the head / arms / legs) and only causing growth at the front of the body while doing no change to the body areas behind the chest. Now visualize that. Ech! Needless to say, any enlargement process would have to be 100% instantly penetrative and dispersed enough to not cause any body area to grow faster than another.
The truly scary parts of science fiction growth-rays or shrink rays when you realize that they affect every object in the path of the beam. Oxygen molecules, nitrogen atoms, carbon dioxide, etc will all grow in accordance to the scaling factor of the energy beam. If density is increased, then imagine having nitrogen atoms the density of a ball bearing and size of a marble bouncing around the room at relative velocities. Pew pew pew! And if the growth or shrink rays are "enlarging atoms" as part of their process, then the enlarged/shrank object will no longer work properly in terms of chemical interactions any more (breathing being the most immediate concern) and thermal absorption / radiation. If you can still eat normally, the normal-sized atoms you consume will scale down or up when you are scaled down or up. A gut full of now 1/2 or 2x scaled atoms wrecking havoc in your guts. Or if you eat, then later having your scaled atoms "snap back like elastic" to normal scale, then imagine having all your food forcibly extruded by compression forces from your cells. Fun times, fun times. Like a fountain of goo squeezed from a tube of toothpaste.
Large-sized mechanical equipment has to move slowly for a number of logical reasons. One is hydraulic limitations (overheat the hydraulic oil and really undesirable things happen). The second is material density. Hardened steel can resist impacts and heavy weight, but becomes vulnerable to stress fracturing with twist forces. The bigger, thicker, denser metals cannot radiate absorbed heat as quickly as thinner less-dense metals, so if enough heat builds up rapidly, the metal can weaken by thermal forces alone.
Take metal bar for example, in the thinner human-sized diameters, you can whack that against a concrete wall top with minimal damage to the metal bar (depending on the cross-section diameter and metal type). The same metal scaled to the size of an earth moving crane, whacked against a proportionally-scaled concrete wall top, now has many times the weight being divided into moment-impact force sections by the impact stop. The earth moving crane has a much higher chance of splitting and bending by the impact versus the human-sized metal bar because there is so much more mass coming to a dead stop instantly with a very similar metal.
The only exceptions to this physics / biology rule are found in comicbooks. PYM PARTICLES add similar-type mass temporally to an enlarged object, thusly increasing density (but not changing the bone-length to muscle thickness / muscle length rule). The character of Colossal Boy in the Legion of Superheroes was empowered by "meteorite radiation" which I would assume gave him the ability to enlarge his cellular structure (creating adhesive force fields around those cells) and somehow increasing his mass safely. Needless to say, at this point, no serious scientific effort has been put in play to resolve the biological mass issues of enlarged / shrinking heroes & villains.
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