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【单选题】
波尔山羊被称为世界 “肉用山羊之”,其不仅产肉多,而且肉质细嫩,适口性好,下图为其某组织(其中2为红细胞),下列相关说法正确的是 ( )A.
肌细胞缺氧时， ③的pH会降低，但由于Na 2 CO 3 的调节作用， ③的pH会维持相对恒定
B.
③与⑤相比，③中含有蛋白质较少
C.
②呼吸作用的终产物CO 2 不会引起③pH的变化
D.
②中的氧气到达④进行利用，②处的氧气浓度高
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