首页
登录
职称英语
No Creatures can stride as human beings. They are not physically designed to
No Creatures can stride as human beings. They are not physically designed to
游客
2024-08-14
13
管理
问题
No Creatures can stride as human beings. They are not physically designed to support and balance a vertical body balanced on two long lower limbs, propelled forward by a foot engineered exclusively for body support and forward propulsion and to do so with a stride at high-speed locomotion. While other bipeds walk in a similar fashion, human walk is unique. Bipedalism by itself offers no comparison with the distinctive human gait form. And, significantly, no other biped can actually cover more than a tiny fraction of the walking distance that can be sustained by humans.
Striding requires a special design of hip, knee, and ankle joints, plus an arched foot, plus long lower-limb bones. These "finishing touches" demanded extended evolutionary time. Striding provided numerous advantages over the simple stepping gait. For example, the ability to cover twice the distance with the same number of steps is a definite survival advantage. It also added much speed to running, more height to jumping.
None of this would have been possible without, first, a foot equipped to support and balance an erect body and to produce the leverage necessary to propel the body forward in locomotion. The ape foot was not suited for this. A new kind of foot was essential if those hominids were to become full-scale bipeds. Indeed a pair of human feet has one-fourth of all the body’s 206 bones and 244 joints. Why this extraordinary number of bones and joints concentrated in such a small part of the body?(74)
Because the intricate network of the many different parts required not only for supporting and balancing a heavy superstructure but to enable the multiple motions and actions, hundreds or thousands of times daily
. No other part of the body comes even close to the amount and degree of stresses imposed on it.
The human foot had to go through an extensive evolutionary development in which it underwent enormous design changes in cohering its 28 bones, 37 joints and 107 ligaments, and 32 muscles and tendons to adapt to the body weight and numerous torsions.(75)
In fact, it probably wasn’t until only about 400, 000 years ago that early humans were fully striding, the final touch of human gait.
Orthopedist Philip J. Mayer writes in the Orthopedic Review: "The development of a true stride on an orthopedic foot was the most crucial of all the steps of human evolution. " Nature had perhaps never undertaken an anatomical engineering project of such complexity. [br] Why is the human foot equipped the way it is?
选项
答案
It is equipped to support and balance an erect body and to produce the leverage necessary topropel the body forward in locomotion.
解析
(根据文章第三段第一句,本句承上启下,解释人类脚的独特构造及原因。)
转载请注明原文地址:https://tihaiku.com/zcyy/3719976.html
相关试题推荐
NoCreaturescanstrideashumanbeings.Theyarenotphysicallydesignedto
NoCreaturescanstrideashumanbeings.Theyarenotphysicallydesignedto
NoCreaturescanstrideashumanbeings.Theyarenotphysicallydesignedto
NoCreaturescanstrideashumanbeings.Theyarenotphysicallydesignedto
虽然中国妇女在平等方面取得了巨大的进步,但还未完全实现平等就业机会。(makestridetowards)ItistruethatChinese
A.FillingthereservoirYouironisdesignedtofunctionusingtapwat
A.FillingthereservoirYouironisdesignedtofunctionusingtapwat
Versacci,CalvinKleinandVivienneWestwooddesignedtheclothes.[br][origin
Versacci,CalvinKleinandVivienneWestwooddesignedtheclothes.[originaltext
Itdidn’tworrymeatall.Itook________.A、itinstrideB、allinstrideC、ital
随机试题
AmericanValuesI.IndividualfreedomA.Theonev
Moreandmoreforeignstudentsexperiencetheirindependentlifeintheques
身体受到损害要求赔偿的,诉讼时效期限为(??)年。A.1 B.2 C.3
患者女性,30岁,偏头痛急性发作。拟给予药物的作用机制是 A.直接收缩血管
政府运用紧缩性货币政策将会导致()。A.减少货币供给量,提高利率 B.增加货
小学生记忆发展的特点有哪些?
甲因遭丈夫乙的虐待而被迫离家独居。某日其女儿丙(13岁)来看望甲,甲叫丙把家中的
在下列固定资产中,应计提折旧的有()。A.大修理停用的固定资产 B.提前
当卫星天线放置在屋顶或楼顶时,应进行天线()的计算,确认安全后方可施工,并注意
下列合同中,属于依法应当采用书面形式的有()。 A.货物运输合同
最新回复
(
0
)