BIO 2401 Anatomy and Physiology Exam at Central Alabama Community College
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Free BIO 2401 Anatomy and Physiology Exam at Central Alabama Community College Questions
Which of the following places the ear bones in the correct order?
- Malleus-incus-stapes
- Malleus-stapes-incus
- Stapes-malleus-incus
- Incus-malleus-stapes
Explanation
The three ossicles (small bones) of the middle ear are named malleus, incus, and stapes. They transmit sound vibrations from the eardrum to the inner ear. The correct order from the eardrum to the inner ear is:
- Malleus (attached to the eardrum)
- Incus (which connects the malleus to the stapes)
- Stapes (which transmits the vibrations to the oval window of the cochlea)
This is the proper sequence of the bones in the middle ear.
Which type of body plane would separate the body into a right and left half?
- Frontal
- Oblique
- Sagittal
- Cross-cut
- Transverse
Explanation
The sagittal plane divides the body into right and left halves. It runs vertically from front to back, creating a division that can be either midsagittal (exactly down the middle) or parasagittal (off-center). This plane is essential for examining body symmetry and structures in relation to one another from the front to the back of the body. The other planes do not divide the body into right and left halves.
Which of the following correctly defines the function of the mitochondria?
- Directs cell activities and cell reproduction
- Digests materials
- Produces energy
- Detoxifies alcohol
- Produces proteins
- Packages and processes materials for release
- Aids in cell division
Explanation
The primary function of the mitochondria is to produce energy in the form of ATP through cellular respiration. Mitochondria are often referred to as the "powerhouses" of the cell because they generate the majority of the cell’s energy required for various metabolic processes. The energy produced by the mitochondria is essential for maintaining cell function and supporting the cell's activities.
Which type of transport mechanism moves materials from high pressure to low pressure?
- Diffusion
- Osmosis
- Filtration
- Facilitated diffusion
Explanation
Filtration is the process that moves materials from an area of high pressure to an area of low pressure. It typically occurs across capillary walls or other membranes, where fluid (and solutes) are forced through due to pressure differences. This process does not require energy and is often seen in processes like kidney filtration, where blood is filtered under pressure.
Which type of muscle tissue is striated and involuntary?
- Skeletal
- Smooth
- Cardiac
Explanation
Cardiac muscle tissue is striated (having a striped appearance under a microscope) and involuntary (it is not consciously controlled). It is found only in the heart, where it is responsible for pumping blood throughout the body. The striations in cardiac muscle are similar to those in skeletal muscle, but unlike skeletal muscle, cardiac muscle functions involuntarily and has specialized junctions (intercalated discs) that allow coordinated contraction.
A. Sodium ions are inside the neuron and potassium ions are outside the neuron
B. Potassium ions are inside the neuron and sodium ions are outside the neuron
C. Sodium and potassium ions are inside the neuron
D. Sodium and potassium ions are outside the neuron
- Sodium ions are inside the neuron and potassium ions are outside the neuron
- Potassium ions are inside the neuron and sodium ions are outside the neuron
- Sodium and potassium ions are inside the neuron
- Sodium and potassium ions are outside the neuron
Explanation
At rest, the neuron maintains a resting membrane potential due to the unequal distribution of ions across its membrane. The sodium (Na⁺) ions are primarily concentrated outside the neuron, while the potassium (K⁺) ions are concentrated inside the neuron. This distribution is maintained by the sodium-potassium pump, which actively transports sodium ions out of the cell and potassium ions into the cell, using energy (ATP). This creates a resting potential of approximately -70 mV in most neurons. This ion distribution is essential for the generation of action potentials and proper nerve function.
Which type of transport moves materials down a concentration gradient?
- Active
- Passive
Explanation
Passive transport moves materials across the cell membrane down a concentration gradient, meaning from an area of higher concentration to an area of lower concentration. This process does not require energy (ATP). Common types of passive transport include diffusion, facilitated diffusion, and osmosis.
In contrast, active transport requires energy to move substances against the concentration gradient, from an area of lower concentration to an area of higher concentration. This process typically involves transport proteins and ATP.
Which of the following terms represents the covering of a bone located in the medullary cavity?
- Endosteum
- Periosteum
- Lacunae
- Yellow marrow
- Red marrow
Explanation
The endosteum is the thin membrane that lines the inner surface of the bone, including the medullary cavity, which is the central cavity of long bones that contains bone marrow. The endosteum is important for bone growth, repair, and remodeling.
Which of the following divisions of the nervous system has a long preganglionic axon?
- Sympathetic
- Parasympathetic
Explanation
In the parasympathetic division of the autonomic nervous system, the preganglionic axons are typically long and extend from the central nervous system (CNS) to the target organ, where they synapse with the postganglionic neurons. The parasympathetic system is often referred to as the "rest and digest" system and is associated with functions that conserve energy and promote routine maintenance of body systems.
Which bone marking term means a smooth nearly flat articular projection?
- Tuberosity
- Crest
- Trochanter
- Line
- Tubercle
- Condyle
- Epicondyle
- Spine
- I. Head
- J. Facet
- K. Ramus
- L. Meatus
- M. Sinus
- N. Foramen
Explanation
A facet is a smooth, nearly flat articular projection that forms a joint with another bone. It provides a smooth surface for the articulation of bones, allowing for limited movement, such as the joints between the vertebrae in the spine.
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