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3 years ago

Which component of bone is responsible for its strength?

1 answer:

6 0

<span>The answer is osteoid. It begins with unmineralized collagen fibers and ground substance. Later it becomes a calcified matrix. The matrix is mainly made of collagen and calcium ions. When not well mineralized, osteoblasts proliferates hence the bone will not have the desired strength. This results to deformation of bone causing rickets</span>

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Your heart functions in your body as a(n)

Bess [88]

The most appropriate answer is D !!

8 0

3 years ago

Which of the following is a factor that determines the rate of impulse propagation, or conduction velocity, along an axon?a) len

mihalych1998 [28]

Answer:

c) degree of myelination of the axon

Explanation:

The myelin sheath covers many axons in central nervous system (CNS) ( by oligodendrocytes) and in the peripheral nervous system (PNS) (by Schwann cells). Their function is to insulate axons and to increase the speed at which information travels from one nerve cell to another.

Nerve conduction velocity is specific to each individual and depend on the level to which that axon is myelinated, but also on an axon's diameter.

7 0

3 years ago

A sand storage tank used by the highway department for winter storms is leaking. As the sand leaks out, it forms a conical pile.

harina [27]

Answer:

Rate of change of volume of the pile $= 54\pi$

Explanation:

Given -

Rate of increase of the base of the pile $= 0.75$ inches per minute

Height of the pile $= 2 *$ the radius of the base

Let "h" be the height of the pile and "r" be the radius of the base.

Then $h = 2* r$

Radius "r" $= 6$ inches

Rate of change of radius i.e

$\frac{dr}{dt} = 0.75$

Volume of conical pile

$\frac{\pi }{3} * r^2 * h\\= \frac{\pi }{3} * r^2 * 2 * r\\= \frac{\pi }{3} *2* r^3$

Change in volume of conical pile

$\frac{dV}{dt} = \frac{dr}{dt} * \frac{6* \pi * r^2 }{3}$

Substituting the value of rate of change of radius, we get -

$\frac{dV}{dt} = 2 * \pi * (6^2) * (0.75)\\\frac{dV}{dt} = 54 \pi$

Rate of change of volume of the pile $= 54\pi$

8 0

3 years ago

Assume that in cattle a spotted coat is dominant to an even coat, short horns are dominant to long horns, and the traits for coa

kow [346]

Answer:

C. 1/4

Explanation:

Let's assume that the allele for the spotted coat is "S" and the one for the even coat is "s". The allele "L" gives short horns while the recessive allele "l" imparts long horns. The genotype of the cattle heterozygous for both traits would be SsLl. A cross between two heterozygous cattle would produce progeny in following phenotype ratio=

9 spotted coat and short horns: 3 even coat and short horns: 3 spotted coat and long horns: 1 even coat and long horns.

Therefore, the proportion of the progeny with long horns = 4/16= 1/4

8 0

4 years ago

Fluorine (F) has seven electrons in its outter most shell. Flouride ?

Ainat [17]

Answer:

Fluoride theoretically should have 8

Explanation:

Fluoride is the Fluorine ion, meaning electrons are added or substracted from Fluorine to form Fluoride. Usually, an ion has a full outer shell.

6 0

3 years ago