Form 4 BiologyBiologi Tingkatan 4

Chapter 14: Support & MovementBab 14: Sokongan dan Pergerakan

Skeletons, joints, and how organisms moveRangka, sendi, dan cara organisma bergerak

ðŸŽŊ What You'll LearnðŸŽŊ Objektif Pembelajaran

Describe the types of skeletonsMenerangkan jenis-jenis rangka

Describe the human axial and appendicular skeletonMenerangkan rangka paksi dan apendiks manusia

Explain types of joints and their movementsMenerangkan jenis-jenis sendi dan pergerakannya

Describe muscle structure and antagonistic pairsMenerangkan struktur otot dan pasangan antagonis

ðŸĶī Joint TypesðŸĶī Jenis Sendi

JointJenis SendiMovementPergerakanExampleContoh
Ball & socketSfera dan soketAll directions (360°)Semua arah (360°)Shoulder, hipBahu, pinggul
HingeEngselOne plane (flexion/extension)Satu arah (fleksi/ekstensi)Elbow, kneeSiku, lutut
PivotPaksi putarRotationPutaranNeck (atlas-axis)Kepala (atlas-paksi)
GlidingGelangsarSlidingGelongsoranBetween vertebraeAntara vertebra
ðŸ’Ą Memory Trick:Trik Ingatan: "Ball and socket = 360°" | "Hinge = Door" | "Biceps bends, Triceps straightens""Sfera dan soket = 360°" | "Engsel = Pintu" | "Bisep bengkok, Trisep lurus"

💊 Antagonistic Muscles💊 Otot Antagonis

MuscleOtotActionTindakan
BicepsBisepFlexes arm (contracts when bending)Mengecut ketika lengan dibengkokkan
TricepsTrisepExtends arm (contracts when straightening)Mengecut ketika lengan diluruskan
Support & Movement Axial Skeleton Skull, Vertebral column Rib cage, Sternum Protects vital organs Appendicular Skeleton Pectoral girdle, Pelvic girdle Limbs (arms, legs) Enables movement Synovial Joint Synovial fluid (lubrication) Cartilage (shock absorber) Ligament (bone-to-bone) Tendon (muscle-to-bone) Antagonistic Muscle Pair (Arm) Biceps CONTRACTS Triceps RELAXES = Arm FLEXES (bends) SPM: One contracts, the other relaxes — they work as a pair!

⚡ Quick Check⚡ Semakan Cepat

Which joint allows full 360° rotation?Sendi manakah yang membolehkan putaran 360° penuh?

ABall and socketSfera dan soket
BHingeEngsel
CPivotPaksi putar
DGlidingGelangsar

ðŸ‡ēðŸ‡ū Malaysian ContextðŸ‡ēðŸ‡ū Konteks Malaysia

Arthritis and osteoporosis are common among elderly Malaysians. Sports injuries are frequent in football and badminton. Motor vehicle accidents cause many fractures (high rate in Malaysia).Artritis dan osteoporosis adalah masalah kesihatan biasa dalam kalangan warga emas Malaysia. Kecederaan sukan kerap berlaku dalam bola sepak dan badminton. Kemalangan kenderaan bermotor menyebabkan banyak patah tulang (kadar tinggi di Malaysia).

📋 SPM Practice📋 Latihan SPM

SPM QuestionSoalan SPM

Explain how antagonistic muscles work together to move the arm. [4 marks]Terangkan bagaimana otot antagonis bekerjasama untuk menggerakkan lengan. [4 markah]

📌 Exam Tip:📌 Tips Peperiksaan: Biceps contracts (flexion) while triceps relaxes; Triceps contracts (extension) while biceps relaxes. They work in opposite pairs.Bisep mengecut (fleksi) manakala trisep relaks; Trisep mengecut (ekstensi) manakala bisep relaks. Mereka bekerja secara berlawanan pasang.

🃏 Flashcards🃏 Kad Imbas

Ball & socket joint?Sendi sfera dan soket?
Allows 360° movement (shoulder, hip)Membolehkan pergerakan 360° (bahu, pinggul)
Hinge joint example?Contoh sendi engsel?
Elbow, kneeSiku, lutut
Synovial fluid function?Fungsi cecair sinovial?
Lubricates the jointMelicinkan permukaan sendi
Biceps function?Fungsi bisep?
Flexes the armMembengkokkan lengan
Ligament joins?Ligamen menyambung?
Bone to boneTulang ke tulang