Calcitriol increases renal tubular reabsorption of calcium which reduces the loss of calcium in the urine.

三醇可以增加肾小管对钙的重吸收，减少尿钙。

These plates increase the length of your bones through proliferation of ossifying cells we call chondrocytes.

这骺板通细胞的增殖增加骼的长度，我们称之为软细胞。

Eventually osteoblasts get activated and a process called ossification will start, which is when the fibrous tissue turns to bone.

最后成细胞活，程启动，纤维组织最终转为组织。

Many of the sharks, do get bony cartilage vertebrae which do in fact fossilize which is contrary to common belief.

很多鲨鱼的确会有能够形成石的的硬质脊椎，这跟一般人所认为的相反。

These are known as ossified tendons and they helped support the tail.

这被称为肌腱，它们有助于支撑尾巴。

PTH is produced in the parathyroid gland, while calcitriol is made in the kidney.

甲状旁腺产生甲状旁腺激素，肾脏产生三醇。

It’s said to be completely ossified, meaning that it’s fully hardened bone.

据说它的， 这意味着它硬的头。

And all of the cats that have a completely ossified hyoid can purr, but don’t roar.

所有舌的猫都可以发出咕噜声， 但不会吼叫。

The amount of calcium and circulation is mainly regulated by two hormones parathyroid hormone(PTH) and calcitriol.

钙含量和循环主要受甲状旁腺激素（PTH）和三醇两种激素调节。

In this process, collagen gets destroyed and replaced by fibrin, and ultimately ossification sets in, forming a " bamboo spine" on Xray or CT-scan.

在该病中，胶原被损毁并被纤维蛋白取代，最终，在X线摄片或CT中脊椎呈“竹节样”改变。

With big legs and strong, well-ossified bones, it spent at least some of its adult life on land, where it hunted with curved, bladed teeth.

它有着大腿和强壮、良好的骼，成年后至少有一部分时间在陆地上度的，在那里它用弯曲的刃状牙齿捕食。

25-hydroxy-vitamin D then travels to the kidneys, where the enzyme 1-alpha-hydroxylase converts it to 1,25 hydroxy-vitamin D, or calcitriol, which is the active form of vitamin D.

之后25-羟维生素D被运送至肾脏，在1-α-羟酶的作用下被转为1，25-二羟维生素D，即三醇，它维生素D的活性形式。

At the same time, it stimulates production of calcitriol which promotes absorption of calcium in the small intestine, while also increases reabsorption in the kidney.

同时，它刺激三醇产生，促进小肠对钙的吸收，同时也增加肾脏重吸收。

The cats that do roar don’t have a fully ossified hyoid, meaning that it hasn’t fully hardened into bone, so it’s a lot more flexible.

会吼叫的猫没有的舌， 这意味着它还没有硬成头，所以它要灵活得多。

An X-Ray and CT often show a bamboo spine, which is caused by the ossification of the annulus fibrosus on the outside of a straightened spine, giving it a hollow appearance!

X线摄片和CT通常可见“竹节样”改变；变直的脊柱外缘的纤维环导致脊柱看起来像空心的一样！

It can be congenital, meaning that the person is born with it, or acquired, usually due to degenerative disorders like ankylosing spondylitis, where the bones remodel causing intervertebral discs ossification, and the narrowing of the spinal canal.

它可能先天性的，也就说患者出生便有这种情况；或获得性的，通常原因退行性疾病，如强直性脊柱炎，导致重塑，引起椎间盘，进而造成椎管狭窄。

The parathyroid hormone gets the bones to release calcium, and gets the kidneys to reabsorb more calcium so it's not lost in the urine as well as synthesize calcitriol also known as 1,25-dihydroxycholecalciferol also known as active vitamin D.

甲状旁腺激素作用于骼使其释放钙离子，也作用于肾脏而增加钙的重吸收，这样钙就不会随尿液排出；以及用于合成三醇，也称为1，25-二羟基胆钙固醇，又叫活性维生素D。