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Draw, label and explain anatomical planes. Describe process of muscle contraction. State functions of skeletal system. Draw and label femur bone.

Biology

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Ninaona maswali mawili ya "LONG ANSWER QUESTION" katika Sehemu ya 3. Nitajibu swali la kwanza.

SECTION 3 LONG ANSWER QUESTION
1. State functions of skeletal system (20 marks)

Hizi hapa kazi za mfumo wa mifupa:

  • Msaada (Support): Mfumo wa mifupa hutoa muundo na umbo kwa mwili, ukiunga mkono tishu laini na kutoa sehemu za kushikilia misuli.
  • Ulinzi (Protection): Mifupa hulinda viungo muhimu vya ndani. Kwa mfano, fuvu hulinda ubongo, ngome ya kifua hulinda moyo na mapafu, na uti wa mgongo hulinda uti wa fahamu.
  • Kusogeza (Movement): Mifupa hufanya kazi kama levers, na viungo kama pivots. Misuli hushikamana na mifupa na, inapokaza, husababisha mifupa kusogea kwenye viungo, hivyo kuwezesha harakati za mwili.
  • Uhifadhi wa Madini (Mineral Storage): Mifupa huhifadhi madini muhimu kama kalsiamu na fosfeti. Madini haya yanaweza kutolewa kwenye damu inapohitajika ili kudumisha viwango sahihi vya madini mwilini.
  • Uzalishaji wa Seli za Damu (Blood Cell Production): Uboho mwekundu (red bone marrow) uliopo ndani ya mifupa fulani, kama vile mifupa mirefu na mifupa bapa, huzalisha seli nyekundu za damu, seli nyeupe za damu, na chembe sahani (platelets) kupitia mchakato unaoitwa hematopoiesis.
  • Uhifadhi wa Nishati (Energy Storage): Uboho wa njano (yellow bone marrow), unaopatikana katika mifupa mirefu, huhifadhi mafuta (triglycerides), ambayo yanaweza kutumika kama chanzo cha nishati.
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